soc/mediatek/mt8195: replace SPDX identifiers to GPL-2.0-only OR MIT

This replaces 'SPDX-License-Identifier' tags in all the files under
soc/mediatek/mt8195 for better code re-use in other open source
software stack.

These files were originally from MediaTek and follow coreboot's main
license: "GPL-2.0-only". Now MediaTek replaces these files to
"GPL-2.0-only OR MIT" license.

Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Change-Id: I79a585c2a611dbfd294c1c94f998d972118b5c52
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66625
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
diff --git a/src/soc/mediatek/mt8195/soc.c b/src/soc/mediatek/mt8195/soc.c
index 1aec0de..9383ac7 100644
--- a/src/soc/mediatek/mt8195/soc.c
+++ b/src/soc/mediatek/mt8195/soc.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
 #include <bootmem.h>
 #include <console/console.h>