libgfxinit: Enable G45 support (for GM45/X4X)

Change-Id: Ia637d32ffaa5d280320955d34141eddc8b7df981
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22222
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/x4x/gma.c

@@ -33,6 +33,7 @@
 #include <drivers/intel/gma/edid.h>
 #include <drivers/intel/gma/i915.h>
 #include <drivers/intel/gma/opregion.h>
+#include <drivers/intel/gma/libgfxinit.h>
 #include <pc80/vga.h>
 #include <pc80/vga_io.h>
 
@@ -411,6 +412,9 @@ static void gma_func0_init(struct device *dev)
 			return;
 		}
 		native_init(dev);
+	} else if (IS_ENABLED(CONFIG_MAINBOARD_USE_LIBGFXINIT)) {
+		int lightup_ok;
+		gma_gfxinit(&lightup_ok);
 	} else {
 		pci_dev_init(dev);
 	}