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/nds32/lib/Makefile b/arch/nds32/lib/Makefile
index c88ad72..501f26f 100644
--- a/arch/nds32/lib/Makefile
+++ b/arch/nds32/lib/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
@@ -5,9 +6,6 @@
 # Copyright (C) 2011 Andes Technology Corporation
 # Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
 # Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 
 obj-y += cache.o
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
diff --git a/arch/nds32/lib/boot.c b/arch/nds32/lib/boot.c
index 1313506..c50e8e5 100644
--- a/arch/nds32/lib/boot.c
+++ b/arch/nds32/lib/boot.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2011 Andes Technology Corporation
  * Rick Chen, Andes Technology Corporation <rick@andestech.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 
diff --git a/arch/nds32/lib/bootm.c b/arch/nds32/lib/bootm.c
index 0d7f578..0cfdc52 100644
--- a/arch/nds32/lib/bootm.c
+++ b/arch/nds32/lib/bootm.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2011 Andes Technology Corporation
  * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
  * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/nds32/lib/cache.c b/arch/nds32/lib/cache.c
index 8469481..9ab30d1 100644
--- a/arch/nds32/lib/cache.c
+++ b/arch/nds32/lib/cache.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2012 Andes Technology Corporation
  * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
  * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/nds32/lib/interrupts.c b/arch/nds32/lib/interrupts.c
index 72ff78d..966c19a 100644
--- a/arch/nds32/lib/interrupts.c
+++ b/arch/nds32/lib/interrupts.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2002
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
@@ -6,8 +7,6 @@
  * Copyright (C) 2011 Andes Technology Corporation
  * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
  * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>