mb/lenovo/x230: Enable libgfxinit

Tested on X230 with an external screen connected to every one of the
DP ports (miniDP on mainboard, two DP ports on dock), the GRUB payload
can display on both the external screen and the internal LVDS screen.

This is a copy-paste of I8e02c8003ff745d05ee272c59377174847f5219c.

Change-Id: I8f270d558668c1fe41bcdcc7d6d2aa7f053c85b6
Signed-off-by: Iru Cai <mytbk920423@gmail.com>
Reviewed-on: https://review.coreboot.org/19412
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/lenovo/x230/Kconfig

@@ -19,6 +19,8 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SANDYBRIDGE_IVYBRIDGE_LVDS
 	select DRIVERS_RICOH_RCE822
 	select MAINBOARD_HAS_LPC_TPM
+	select MAINBOARD_HAS_LIBGFXINIT
+	select GFX_GMA_INTERNAL_IS_LVDS
 
 	# Workaround for EC/KBC IRQ1.
 	select SERIRQ_CONTINUOUS_MODE

src/mainboard/lenovo/x230/Makefile.inc

@@ -15,3 +15,5 @@
 
 smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 romstage-y += gpio.c
+
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads

src/mainboard/lenovo/x230/gma-mainboard.ads

@@ -0,0 +1,20 @@
+with HW.GFX.GMA;
+with HW.GFX.GMA.Display_Probing;
+
+use HW.GFX.GMA;
+use HW.GFX.GMA.Display_Probing;
+
+private package GMA.Mainboard is
+
+   ports : constant Port_List :=
+     (DP1,
+      DP2,
+      DP3,
+      HDMI1,
+      HDMI2,
+      HDMI3,
+      Analog,
+      Internal,
+      others => Disabled);
+
+end GMA.Mainboard;