mb/lenovo/x201: Allow use of libgfxinit

Tested on LVDS (internal), VGA and HDMI (on the dock DP++ connector) output with
both native resolution and textmode.

Change-Id: Ibfcb586d7b4cac7f1d22540bb96c288704a277a0
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/27513
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/x201/Kconfig

@@ -15,6 +15,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select INTEL_INT15
 	select HAVE_ACPI_RESUME
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
+	select MAINBOARD_HAS_LIBGFXINIT
 	select SUPERIO_NSC_PC87382
 	select DRIVERS_LENOVO_WACOM
 	select MAINBOARD_HAS_LPC_TPM

src/mainboard/lenovo/x201/Makefile.inc

@@ -18,3 +18,5 @@ smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 romstage-y += dock.c
 ramstage-y += dock.c
 romstage-y += gpio.c
+
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads

src/mainboard/lenovo/x201/gma-mainboard.ads

@@ -0,0 +1,30 @@
+--
+-- This file is part of the coreboot project.
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+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 :=
+     (DP2, -- DP++ connector on the dock
+      HDMI2,
+      Analog,
+      Internal,
+      others => Disabled);
+
+end GMA.Mainboard;