src/mainboard: Replace GPLv2 long form headers with SPDX header

Change-Id: I64d9468682a4aae3084b17b8724d035f17d01dff
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41187
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/mainboard/sapphire/pureplatinumh61/devicetree.cb b/src/mainboard/sapphire/pureplatinumh61/devicetree.cb
index 529e6fe..a88287e 100644
--- a/src/mainboard/sapphire/pureplatinumh61/devicetree.cb
+++ b/src/mainboard/sapphire/pureplatinumh61/devicetree.cb
@@ -1,17 +1,5 @@
-#
 # 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.
-#
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 chip northbridge/intel/sandybridge
 	device cpu_cluster 0x0 on