drivers/intel/gma/opregion.c: Use __func__

Change-Id: Ia45825ade0c9d24d5b87882e21bfc6df82a693e6
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49550
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/src/drivers/intel/gma/opregion.c b/src/drivers/intel/gma/opregion.c
index 4e9f94d0..e1ed6c8 100644
--- a/src/drivers/intel/gma/opregion.c
+++ b/src/drivers/intel/gma/opregion.c
@@ -155,7 +155,7 @@
 		return CB_ERR;
 	}
 
-	printk(BIOS_DEBUG, "GMA: locate_vbt_vbios: %x %x %x %x %x\n",
+	printk(BIOS_DEBUG, "GMA: %s: %x %x %x %x %x\n", __func__,
 		oprom->signature, pcir->vendor, pcir->classcode[0],
 		pcir->classcode[1], pcir->classcode[2]);