scripts: use SPDX tag in get_maintainer and checkpatch

Add the appropriate SPDX tag to these scripts.

Miscellanea:

o Add my copyright to checkpatch

Link: http://lkml.kernel.org/r/d08e49e8f6562c58a63792aa64306d1851f81f4b.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index 99c96e8..30eca36 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -1,4 +1,6 @@
 #!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
+#
 # (c) 2007, Joe Perches <joe@perches.com>
 #           created from checkpatch.pl
 #
@@ -7,8 +9,6 @@
 #
 # usage: perl scripts/get_maintainer.pl [OPTIONS] <patch>
 #        perl scripts/get_maintainer.pl [OPTIONS] -f <file>
-#
-# Licensed under the terms of the GNU GPL License version 2
 
 use warnings;
 use strict;