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/include/asm/mach-generic/cpu-feature-overrides.h b/arch/mips/include/asm/mach-generic/cpu-feature-overrides.h
index 613f844..38f2302 100644
--- a/arch/mips/include/asm/mach-generic/cpu-feature-overrides.h
+++ b/arch/mips/include/asm/mach-generic/cpu-feature-overrides.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2003 Ralf Baechle
- *
- * SPDX-License-Identifier:	GPL-2.0
  */
 #ifndef __ASM_MACH_GENERIC_CPU_FEATURE_OVERRIDES_H
 #define __ASM_MACH_GENERIC_CPU_FEATURE_OVERRIDES_H
diff --git a/arch/mips/include/asm/mach-generic/ioremap.h b/arch/mips/include/asm/mach-generic/ioremap.h
index 6b191d5..d6258f5 100644
--- a/arch/mips/include/asm/mach-generic/ioremap.h
+++ b/arch/mips/include/asm/mach-generic/ioremap.h
@@ -1,6 +1,4 @@
-/*
- * SPDX-License-Identifier:	GPL-2.0
- */
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ASM_MACH_GENERIC_IOREMAP_H
 #define __ASM_MACH_GENERIC_IOREMAP_H
 
diff --git a/arch/mips/include/asm/mach-generic/mangle-port.h b/arch/mips/include/asm/mach-generic/mangle-port.h
index f18e53f..3f95bbc 100644
--- a/arch/mips/include/asm/mach-generic/mangle-port.h
+++ b/arch/mips/include/asm/mach-generic/mangle-port.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2003, 2004 Ralf Baechle
- *
- * SPDX-License-Identifier:	GPL-2.0
  */
 #ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H
 #define __ASM_MACH_GENERIC_MANGLE_PORT_H
diff --git a/arch/mips/include/asm/mach-generic/spaces.h b/arch/mips/include/asm/mach-generic/spaces.h
index ab06674..b7eac32 100644
--- a/arch/mips/include/asm/mach-generic/spaces.h
+++ b/arch/mips/include/asm/mach-generic/spaces.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 1994 - 1999, 2000, 03, 04 Ralf Baechle
  * Copyright (C) 2000, 2002  Maciej W. Rozycki
  * Copyright (C) 1990, 1999, 2000 Silicon Graphics, Inc.
- *
- * SPDX-License-Identifier:	GPL-2.0
  */
 #ifndef _ASM_MACH_GENERIC_SPACES_H
 #define _ASM_MACH_GENERIC_SPACES_H