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/mma/mma_automated_test.sh

@@ -1,14 +1,5 @@
 #!/usr/bin/env bash
-#
-# 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; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FIMMA_TEST_NAMEESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 MMA_LOCAL_DATA_STORAGE=/usr/local/mma
 #