3rdparty/libgfxinit: Update submodule pointer

Update to current master.

This includes:
- G45 support
- fixes scaling on eDP (needed for working textmode on eDP)
- gfx_test drawing and moving cursors
- Adding support for Tiling on <= Haswell
- Allow changes to the framebuffer configurarion without resetting the
pipe.

Change-Id: I4ff3c17ec7308115de7bf2f2bb9276c2fad41253
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/26823
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3rdparty/libgfxinit

@@ -1 +1 @@
-Subproject commit 98a673dc57d90cc79e64c53bd02cfcc1c48ea1aa
+Subproject commit 718c79bb0713b5b90c9cc44e03197dc777066e3d