util: Use SPDX headers

Change-Id: I2858fdf74e782f425d56653491cdebe83c185d19
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41208
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

util/cavium/devicetree_convert.py

@@ -1,16 +1,6 @@
 #!/usr/bin/env python2
+# SPDX-License-Identifier: GPL-3.0-or-later
 # devicetree_convert Tool to convert a DTB to a static C file
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
 
 from pyfdt.pyfdt import FdtBlobParse
 import argparse