src/arch/arm64: Convert to SPDX license header

This also drops individual copyright notices, all mentioned authors in
that part of the tree are already listed in AUTHORS.

Change-Id: Ic5eddc961d015328e5a90994b7963e7af83cddd3
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39279
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/arch/arm64/eabi_compat.c b/src/arch/arm64/eabi_compat.c
index 79b2017..22268b2 100644
--- a/src/arch/arm64/eabi_compat.c
+++ b/src/arch/arm64/eabi_compat.c
@@ -1,16 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* This file is part of the coreboot project. */
 /*
- * This file is part of the coreboot project.
- *
- * 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 2 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.
- *
  * Utility functions needed for (some) EABI conformant tool chains.
  */