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/arm/mach-snapdragon/include/mach/gpio.h b/arch/arm/mach-snapdragon/include/mach/gpio.h
index ff949b2..bbc2bc1 100644
--- a/arch/arm/mach-snapdragon/include/mach/gpio.h
+++ b/arch/arm/mach-snapdragon/include/mach/gpio.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Empty gpio.h
  *
  * This file must stay as arch/arm/include/asm/gpio.h requires it.
  *
  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
diff --git a/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h b/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h
index 1094b14..ae78438 100644
--- a/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h
+++ b/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Qualcomm APQ8916 sysmap
  *
  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #ifndef _MACH_SYSMAP_APQ8016_H
 #define _MACH_SYSMAP_APQ8016_H
diff --git a/arch/arm/mach-snapdragon/include/mach/sysmap-apq8096.h b/arch/arm/mach-snapdragon/include/mach/sysmap-apq8096.h
index fb89de2..14febb6 100644
--- a/arch/arm/mach-snapdragon/include/mach/sysmap-apq8096.h
+++ b/arch/arm/mach-snapdragon/include/mach/sysmap-apq8096.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Qualcomm APQ8096 sysmap
  *
  * (C) Copyright 2017 Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #ifndef _MACH_SYSMAP_APQ8096_H
 #define _MACH_SYSMAP_APQ8096_H