3rdparty/libgfxinit: Update submodule pointer

Update libgfxinit to the latest master. Changes:

* Remove trailing whitespace in debug output.
* Change some types to make it verify with SPARK Pro.
* Add Broxton (Apollo Lake) support for eDP/DP/HDMI.
* Add Linux user-space test tool `gfx_test`.
* Add a README describing libgfxinit and the build process.

TEST=Booted lenovo/t420 and verified that internal and
     external displays are working.

Change-Id: I4d0e23b8a254234173461b831585eae58d3af58e
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20091
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

1 files changed, 0 insertions, 0 deletions

diff --git a/3rdparty/libgfxinit b/3rdparty/libgfxinit
-Subproject 31a5217d39f95b51dc1fbe452f0e169507ca95d
+Subproject fb4f8ce26a05c2304367c066b80651994165837