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/board/freescale/mpc8544ds/Makefile b/board/freescale/mpc8544ds/Makefile
index 3359eea..1693ae8 100644
--- a/board/freescale/mpc8544ds/Makefile
+++ b/board/freescale/mpc8544ds/Makefile
@@ -1,10 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # Copyright 2007 Freescale Semiconductor, Inc.
 # (C) Copyright 2001-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	+= mpc8544ds.o
 obj-y	+= ddr.o
diff --git a/board/freescale/mpc8544ds/ddr.c b/board/freescale/mpc8544ds/ddr.c
index 93c7f4b..c4d9853 100644
--- a/board/freescale/mpc8544ds/ddr.c
+++ b/board/freescale/mpc8544ds/ddr.c
@@ -1,7 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright 2008 Freescale Semiconductor, Inc.
- *
- * SPDX-License-Identifier:	GPL-2.0
  */
 
 #include <common.h>
diff --git a/board/freescale/mpc8544ds/law.c b/board/freescale/mpc8544ds/law.c
index e72a1f4..52cec7f 100644
--- a/board/freescale/mpc8544ds/law.c
+++ b/board/freescale/mpc8544ds/law.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2008, 2010 Freescale Semiconductor, Inc.
  *
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/board/freescale/mpc8544ds/mpc8544ds.c b/board/freescale/mpc8544ds/mpc8544ds.c
index a283365..dbfa80a 100644
--- a/board/freescale/mpc8544ds/mpc8544ds.c
+++ b/board/freescale/mpc8544ds/mpc8544ds.c
@@ -1,7 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2007,2009-2010 Freescale Semiconductor, Inc.
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/board/freescale/mpc8544ds/tlb.c b/board/freescale/mpc8544ds/tlb.c
index 24aa4ec..7bd4629 100644
--- a/board/freescale/mpc8544ds/tlb.c
+++ b/board/freescale/mpc8544ds/tlb.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2008 Freescale Semiconductor, Inc.
  *
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>