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/doc/DocBook/Makefile b/doc/DocBook/Makefile
index 9caa512..820b1fb 100644
--- a/doc/DocBook/Makefile
+++ b/doc/DocBook/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 ###
 # This makefile is used to generate the kernel documentation,
 # primarily based on in-line comments in various source files.
@@ -5,9 +6,6 @@
 # to document the SRC - and how to read it.
 # To add a new book the only step required is to add the book to the
 # list of DOCBOOKS.
-#
-# SPDX-License-Identifier:	GPL-2.0
-#
 
 DOCBOOKS := linker_lists.xml stdio.xml