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/avionic-design/common/pinmux-config-tamonten-ng.h b/board/avionic-design/common/pinmux-config-tamonten-ng.h
index 00634f1..e7215b1 100644
--- a/board/avionic-design/common/pinmux-config-tamonten-ng.h
+++ b/board/avionic-design/common/pinmux-config-tamonten-ng.h
@@ -1,8 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2013
  * Avionic Design GmbH <www.avionic-design.de>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef _PINMUX_CONFIG_TAMONTEN_NG_H_
diff --git a/board/avionic-design/common/tamonten-ng.c b/board/avionic-design/common/tamonten-ng.c
index 106be9b..10278de 100644
--- a/board/avionic-design/common/tamonten-ng.c
+++ b/board/avionic-design/common/tamonten-ng.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2013
  * Avionic Design GmbH <www.avionic-design.de>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/board/avionic-design/common/tamonten.c b/board/avionic-design/common/tamonten.c
index f78c007..988f057 100644
--- a/board/avionic-design/common/tamonten.c
+++ b/board/avionic-design/common/tamonten.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  (C) Copyright 2010,2011
  *  NVIDIA Corporation <www.nvidia.com>
  *  (C) Copyright 2011-2012
  *  Avionic Design GmbH <www.avionic-design.de>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/board/avionic-design/medcom-wide/Makefile b/board/avionic-design/medcom-wide/Makefile
index 1351d1f..fb5fd38 100644
--- a/board/avionic-design/medcom-wide/Makefile
+++ b/board/avionic-design/medcom-wide/Makefile
@@ -1,10 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 #  (C) Copyright 2010,2011
 #  NVIDIA Corporation <www.nvidia.com>
 #  (C) Copyright 2011,2012
 #  Avionic Design GmbH <www.avionic-design.de>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	:= ../common/tamonten.o
diff --git a/board/avionic-design/plutux/Makefile b/board/avionic-design/plutux/Makefile
index 1351d1f..fb5fd38 100644
--- a/board/avionic-design/plutux/Makefile
+++ b/board/avionic-design/plutux/Makefile
@@ -1,10 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 #  (C) Copyright 2010,2011
 #  NVIDIA Corporation <www.nvidia.com>
 #  (C) Copyright 2011,2012
 #  Avionic Design GmbH <www.avionic-design.de>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	:= ../common/tamonten.o
diff --git a/board/avionic-design/tec-ng/Makefile b/board/avionic-design/tec-ng/Makefile
index 8ec9b88..46df14d 100644
--- a/board/avionic-design/tec-ng/Makefile
+++ b/board/avionic-design/tec-ng/Makefile
@@ -1,8 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # (C) Copyright 2013
 # Avionic Design GmbH <www.avionic-design.de>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	:= ../common/tamonten-ng.o
diff --git a/board/avionic-design/tec/Makefile b/board/avionic-design/tec/Makefile
index 1351d1f..fb5fd38 100644
--- a/board/avionic-design/tec/Makefile
+++ b/board/avionic-design/tec/Makefile
@@ -1,10 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 #  (C) Copyright 2010,2011
 #  NVIDIA Corporation <www.nvidia.com>
 #  (C) Copyright 2011,2012
 #  Avionic Design GmbH <www.avionic-design.de>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	:= ../common/tamonten.o