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/m68k/cpu/mcf530x/Makefile b/arch/m68k/cpu/mcf530x/Makefile
index 9492bde..b34cb3c 100644
--- a/arch/m68k/cpu/mcf530x/Makefile
+++ b/arch/m68k/cpu/mcf530x/Makefile
@@ -1,8 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # (C) Copyright 2014  Angelo Dureghello <angelo@sysam.it>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 extra-y	= start.o
 obj-y	= interrupts.o cpu.o speed.o cpu_init.o
diff --git a/arch/m68k/cpu/mcf530x/cpu.c b/arch/m68k/cpu/mcf530x/cpu.c
index 3552af2..c7ae65a 100644
--- a/arch/m68k/cpu/mcf530x/cpu.c
+++ b/arch/m68k/cpu/mcf530x/cpu.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2014  Angelo Dureghello <angelo@sysam.it>
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  */
 
 #include <common.h>
diff --git a/arch/m68k/cpu/mcf530x/cpu_init.c b/arch/m68k/cpu/mcf530x/cpu_init.c
index b09eed8..27d06d9 100644
--- a/arch/m68k/cpu/mcf530x/cpu_init.c
+++ b/arch/m68k/cpu/mcf530x/cpu_init.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2014  Angelo Dureghello <angelo@sysam.it>
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  */
 
 #include <common.h>
diff --git a/arch/m68k/cpu/mcf530x/interrupts.c b/arch/m68k/cpu/mcf530x/interrupts.c
index bf4038d..cd85c69 100644
--- a/arch/m68k/cpu/mcf530x/interrupts.c
+++ b/arch/m68k/cpu/mcf530x/interrupts.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2014  Angelo Dureghello <angelo@sysam.it>
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  */
 
 #include <common.h>
diff --git a/arch/m68k/cpu/mcf530x/speed.c b/arch/m68k/cpu/mcf530x/speed.c
index 3cf1986..ae26047 100644
--- a/arch/m68k/cpu/mcf530x/speed.c
+++ b/arch/m68k/cpu/mcf530x/speed.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2014  Angelo Dureghello <angelo@sysam.it>
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  */
 
 #include <common.h>
diff --git a/arch/m68k/cpu/mcf530x/start.S b/arch/m68k/cpu/mcf530x/start.S
index 536daa4..eb4b338 100644
--- a/arch/m68k/cpu/mcf530x/start.S
+++ b/arch/m68k/cpu/mcf530x/start.S
@@ -1,8 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2015  Angelo Dureghello <angelo@sysam.it>
  * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <asm-offsets.h>