SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/technexion/pico-imx6ul/Makefile b/board/technexion/pico-imx6ul/Makefile
index ac8ff9e..8fdb787 100644
--- a/board/technexion/pico-imx6ul/Makefile
+++ b/board/technexion/pico-imx6ul/Makefile
@@ -1,7 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
 # (C) Copyright 2015 Technexion Ltd.
 # (C) Copyright 2015 Freescale Semiconductor, Inc.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y  := pico-imx6ul.o
diff --git a/board/technexion/pico-imx6ul/imximage.cfg b/board/technexion/pico-imx6ul/imximage.cfg
index c753a71..ad9cc5a 100644
--- a/board/technexion/pico-imx6ul/imximage.cfg
+++ b/board/technexion/pico-imx6ul/imximage.cfg
@@ -1,8 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2015 Freescale Semiconductor, Inc.
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  * Refer doc/README.imximage for more details about how-to configure
  * and create imximage boot image
  *
diff --git a/board/technexion/pico-imx6ul/pico-imx6ul.c b/board/technexion/pico-imx6ul/pico-imx6ul.c
index 39f7e01..8c76778 100644
--- a/board/technexion/pico-imx6ul/pico-imx6ul.c
+++ b/board/technexion/pico-imx6ul/pico-imx6ul.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2015 Technexion Ltd.
  *
  * Author: Richard Hu <richard.hu@technexion.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <asm/arch/clock.h>
diff --git a/board/technexion/pico-imx7d/Makefile b/board/technexion/pico-imx7d/Makefile
index 42cca47..6cfa803 100644
--- a/board/technexion/pico-imx7d/Makefile
+++ b/board/technexion/pico-imx7d/Makefile
@@ -1,6 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0+
 # (C) Copyright 2017 NXP Semiconductors
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y  := pico-imx7d.o
diff --git a/board/technexion/pico-imx7d/imximage.cfg b/board/technexion/pico-imx7d/imximage.cfg
index 202956a..c5caff4 100644
--- a/board/technexion/pico-imx7d/imximage.cfg
+++ b/board/technexion/pico-imx7d/imximage.cfg
@@ -1,8 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2017 Freescale Semiconductor, Inc.
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  * Refer docs/README.imxmage for more details about how-to configure
  * and create imximage boot image
  *
diff --git a/board/technexion/pico-imx7d/pico-imx7d.c b/board/technexion/pico-imx7d/pico-imx7d.c
index 67bab51..44c81ec 100644
--- a/board/technexion/pico-imx7d/pico-imx7d.c
+++ b/board/technexion/pico-imx7d/pico-imx7d.c
@@ -1,7 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2017 NXP Semiconductors
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <asm/arch/clock.h>
diff --git a/board/technexion/tao3530/Makefile b/board/technexion/tao3530/Makefile
index 2aff383..0297daf 100644
--- a/board/technexion/tao3530/Makefile
+++ b/board/technexion/tao3530/Makefile
@@ -1,5 +1,3 @@
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
+# SPDX-License-Identifier: GPL-2.0+
 
 obj-y	:= tao3530.o
diff --git a/board/technexion/tao3530/tao3530.c b/board/technexion/tao3530/tao3530.c
index c5966e3..22d26e5 100644
--- a/board/technexion/tao3530/tao3530.c
+++ b/board/technexion/tao3530/tao3530.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Maintainer :
  *      Tapani Utriainen <linuxfae@technexion.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
 #include <netdev.h>
diff --git a/board/technexion/tao3530/tao3530.h b/board/technexion/tao3530/tao3530.h
index 4a94399..f5ffce8 100644
--- a/board/technexion/tao3530/tao3530.h
+++ b/board/technexion/tao3530/tao3530.h
@@ -1,8 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright TechNexion 2010
  * Edward Lin <linuxfae@technexion.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #ifndef _TAO3530_H_
 #define _TAO3530_H_
diff --git a/board/technexion/twister/Makefile b/board/technexion/twister/Makefile
index 2a91021..3408dc0 100644
--- a/board/technexion/twister/Makefile
+++ b/board/technexion/twister/Makefile
@@ -1,9 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # Copyright (C) 2011 Ilya Yanok, Emcraft Systems
 #
 # Based on ti/evm/Makefile
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	:= twister.o
diff --git a/board/technexion/twister/twister.c b/board/technexion/twister/twister.c
index 8c38f14..1166886 100644
--- a/board/technexion/twister/twister.c
+++ b/board/technexion/twister/twister.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2011
  * Stefano Babic, DENX Software Engineering, sbabic@denx.de.
  *
  * Copyright (C) 2009 TechNexion Ltd.
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/board/technexion/twister/twister.h b/board/technexion/twister/twister.h
index e286bd4..a56187d 100644
--- a/board/technexion/twister/twister.h
+++ b/board/technexion/twister/twister.h
@@ -1,10 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2011
  * Stefano Babic, DENX Software Engineering, sbabic@denx.de.
  *
  * Copyright (C) 2010 TechNexion Ltd.
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef _TAM3517_H_