doc: ABI scripts: add a SPDX header file

released under GPL v2.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 774e9b8..c738cb79 100755
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0
 
 use strict;
 use Pod::Usage;