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/arch/mips/mach-au1x00/Makefile b/arch/mips/mach-au1x00/Makefile
index c5643e7..4301b9c 100644
--- a/arch/mips/mach-au1x00/Makefile
+++ b/arch/mips/mach-au1x00/Makefile
@@ -1,8 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # (C) Copyright 2011
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	= au1x00_eth.o au1x00_serial.o au1x00_usb_ohci.o au1x00_ide.o
diff --git a/arch/mips/mach-au1x00/au1x00_eth.c b/arch/mips/mach-au1x00/au1x00_eth.c
index 67f4953..84a1f59 100644
--- a/arch/mips/mach-au1x00/au1x00_eth.c
+++ b/arch/mips/mach-au1x00/au1x00_eth.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /* Only eth0 supported for now
  *
  * (C) Copyright 2003
  * Thomas.Lange@corelatus.se
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <config.h>
 
diff --git a/arch/mips/mach-au1x00/au1x00_ide.c b/arch/mips/mach-au1x00/au1x00_ide.c
index ba0b35d..ab52b99 100644
--- a/arch/mips/mach-au1x00/au1x00_ide.c
+++ b/arch/mips/mach-au1x00/au1x00_ide.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2000-2011
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/mips/mach-au1x00/au1x00_serial.c b/arch/mips/mach-au1x00/au1x00_serial.c
index 4784504..4bcbc2d 100644
--- a/arch/mips/mach-au1x00/au1x00_serial.c
+++ b/arch/mips/mach-au1x00/au1x00_serial.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * AU1X00 UART support
  *
@@ -5,8 +6,6 @@
  * Speed and options also hardcoded to 115200 8N1
  *
  *  Copyright (c) 2003	Thomas.Lange@corelatus.se
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <config.h>
diff --git a/arch/mips/mach-au1x00/au1x00_usb_ohci.c b/arch/mips/mach-au1x00/au1x00_usb_ohci.c
index 088e612..999b15a 100644
--- a/arch/mips/mach-au1x00/au1x00_usb_ohci.c
+++ b/arch/mips/mach-au1x00/au1x00_usb_ohci.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * URB OHCI HCD (Host Controller Driver) for USB on the AU1x00.
  *
  * (C) Copyright 2003
  * Gary Jennejohn, DENX Software Engineering <garyj@denx.de>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  * Note: Part of this code has been derived from linux
  *
  */
diff --git a/arch/mips/mach-au1x00/include/mach/au1x00.h b/arch/mips/mach-au1x00/include/mach/au1x00.h
index f76c4c3..e242489 100644
--- a/arch/mips/mach-au1x00/include/mach/au1x00.h
+++ b/arch/mips/mach-au1x00/include/mach/au1x00.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  *
  * BRIEF MODULE DESCRIPTION
@@ -6,8 +7,6 @@
  * Copyright 2000,2001 MontaVista Software Inc.
  * Author: MontaVista Software, Inc.
  *	   ppopov@mvista.com or source@mvista.com
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
  /*