drivers/intel/gma: License libgfxinit glue code under GPL v2

Change-Id: I7a78e16512369cbaada4399dbb855ade358ff046
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41521
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Jacob Garber <jgarber1@ualberta.ca>
diff --git a/src/drivers/intel/gma/gma-gfx_init.ads b/src/drivers/intel/gma/gma-gfx_init.ads
index 7c96f9a..84c4a5b 100644
--- a/src/drivers/intel/gma/gma-gfx_init.ads
+++ b/src/drivers/intel/gma/gma-gfx_init.ads
@@ -1,3 +1,5 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+
 with Interfaces.C;
 
 with HW;
diff --git a/src/drivers/intel/gma/gma.adb b/src/drivers/intel/gma/gma.adb
index 10885e6..43fc7b2 100644
--- a/src/drivers/intel/gma/gma.adb
+++ b/src/drivers/intel/gma/gma.adb
@@ -1,3 +1,5 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+
 with HW.GFX.GMA;
 with HW.GFX.GMA.Display_Probing;
 
diff --git a/src/drivers/intel/gma/gma.ads b/src/drivers/intel/gma/gma.ads
index 0b4b66b..e83fff4 100644
--- a/src/drivers/intel/gma/gma.ads
+++ b/src/drivers/intel/gma/gma.ads
@@ -1,3 +1,5 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+
 with Interfaces.C;
 
 with HW.GFX.EDID;
diff --git a/src/drivers/intel/gma/hires_fb/gma-gfx_init.adb b/src/drivers/intel/gma/hires_fb/gma-gfx_init.adb
index 1393784..92d3a16 100644
--- a/src/drivers/intel/gma/hires_fb/gma-gfx_init.adb
+++ b/src/drivers/intel/gma/hires_fb/gma-gfx_init.adb
@@ -1,3 +1,5 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+
 with CB.Config;
 
 use CB;
diff --git a/src/drivers/intel/gma/text_fb/gma-gfx_init.adb b/src/drivers/intel/gma/text_fb/gma-gfx_init.adb
index 038b76b..04ef30a 100644
--- a/src/drivers/intel/gma/text_fb/gma-gfx_init.adb
+++ b/src/drivers/intel/gma/text_fb/gma-gfx_init.adb
@@ -1,3 +1,5 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+
 with HW.GFX;
 with HW.GFX.GMA;
 with HW.GFX.GMA.Display_Probing;