Patch merged into coreboot/master: drivers/intel/gma: Hook up libgfxinit

the following patch was just integrated into master:
commit 542e9488bd3f084c373e89e869aeca84aaa8c66c
Author: Nico Huber 
Date:   Wed Oct 5 17:47:32 2016 +0200

drivers/intel/gma: Hook up libgfxinit

Add `libgfxinit` as another option for native graphics initialization.
    For that, the function gma_gfxinit() (see drivers/intel/gma/i915.h) has
    to be called by the respective northbridge/soc code.

A mainboard port needs to select `CONFIG_MAINBOARD_HAS_LIBGFXINIT` and
    implement the Ada package `GMA.Mainboard` with a single function `ports`
    that returns a list of ports to be probed for displays.

v2: Update 3rdparty/libgfxinit to its latest master commit to make
        things buildable within coreboot.

v3: Another update to 3rdparty/libgfxinit. Including support to select
        the I2C port for VGA.

Change-Id: I4c7be3745f32853797d3f3689396dde07d4ca950
    Signed-off-by: Nico Huber 
    Reviewed-on: https://review.coreboot.org/16952
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Ronald G. Minnich

See https://review.coreboot.org/16952 for details.

-gerrit