mb/*/*: Use libgfxinit on sandy and ivy bridge boards

Change-Id: I41ad1ce06d9afcc99941affa232fa76ffa6631fb
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/27531
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/mainboard/lenovo/l520/Makefile.inc b/src/mainboard/lenovo/l520/Makefile.inc
index 3afb227..2aa7f0f 100644
--- a/src/mainboard/lenovo/l520/Makefile.inc
+++ b/src/mainboard/lenovo/l520/Makefile.inc
@@ -16,3 +16,5 @@
 romstage-y += romstage.c
 romstage-y += gpio.c
 smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
+
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads