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/pandora/Makefile b/board/pandora/Makefile
index 918b656..c05c8fb 100644
--- a/board/pandora/Makefile
+++ b/board/pandora/Makefile
@@ -1,8 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # (C) Copyright 2000, 2001, 2002
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y	:= pandora.o
diff --git a/board/pandora/pandora.c b/board/pandora/pandora.c
index 3502bbf..4f91dc3 100644
--- a/board/pandora/pandora.c
+++ b/board/pandora/pandora.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2008
  * Grazvydas Ignotas <notasas@gmail.com>
@@ -10,8 +11,6 @@
  *
  * (C) Copyright 2004-2008
  * Texas Instruments, <www.ti.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
 #include <twl4030.h>
diff --git a/board/pandora/pandora.h b/board/pandora/pandora.h
index 268b929..9c4c5d1 100644
--- a/board/pandora/pandora.h
+++ b/board/pandora/pandora.h
@@ -1,8 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2008
  * Grazvydas Ignotas <notasas@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 #ifndef _PANDORA_H_
 #define _PANDORA_H_