soc/intel: Replace GPLv2 long form headers with SPDX header

Change-Id: I468d2ba85033c41ba53333ebbfd6f4108a36e407
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41130
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/tigerlake/me.c

@@ -1,16 +1,5 @@
 /* This file is part of the coreboot project. */
-/*
- * Copyright (C) 2020 Google LLC.
- *
- * 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 FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <bootstate.h>
 #include <intelblocks/cse.h>