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/include/asm/arch-pxa/config.h b/arch/arm/include/asm/arch-pxa/config.h
index 5836945..75b0e49 100644
--- a/arch/arm/include/asm/arch-pxa/config.h
+++ b/arch/arm/include/asm/arch-pxa/config.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2014 Andrew Ruder <andrew.ruder@elecsyscorp.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef _ASM_ARM_PXA_CONFIG_
diff --git a/arch/arm/include/asm/arch-pxa/pxa.h b/arch/arm/include/asm/arch-pxa/pxa.h
index d759aea..428a848 100644
--- a/arch/arm/include/asm/arch-pxa/pxa.h
+++ b/arch/arm/include/asm/arch-pxa/pxa.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * PXA common functions
  *
  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef	__PXA_H__
diff --git a/arch/arm/include/asm/arch-pxa/regs-mmc.h b/arch/arm/include/asm/arch-pxa/regs-mmc.h
index 1b18eea..6d9a736 100644
--- a/arch/arm/include/asm/arch-pxa/regs-mmc.h
+++ b/arch/arm/include/asm/arch-pxa/regs-mmc.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef __REGS_MMC_H__
diff --git a/arch/arm/include/asm/arch-pxa/regs-uart.h b/arch/arm/include/asm/arch-pxa/regs-uart.h
index 313a691..bdd0a47 100644
--- a/arch/arm/include/asm/arch-pxa/regs-uart.h
+++ b/arch/arm/include/asm/arch-pxa/regs-uart.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef	__REGS_UART_H__
diff --git a/arch/arm/include/asm/arch-pxa/regs-usb.h b/arch/arm/include/asm/arch-pxa/regs-usb.h
index 90ffbf4..e46887c 100644
--- a/arch/arm/include/asm/arch-pxa/regs-usb.h
+++ b/arch/arm/include/asm/arch-pxa/regs-usb.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * PXA25x UDC definitions
  *
  * Copyright (C) 2012 Łukasz Dałek <luk0104@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef __REGS_USB_H__