3rdparty/lib{hwbase,gfxinit}: Update to latest master

Simplifies our C interface function gma_gfxinit(), due to the following
changes:

* *libgfxinit* knows about the underlying PCI device now and can
  probe MMIO addresses by itself.
* The framebuffer mapping is now completely handled inside the
  library where we validate that we neither overflow
  - the stolen memory,
  - the GTT address space, the GTT itself nor
  - the aperture window (i.e. resource2 of the PCI device)
    that we use to access the framebuffer.

Other changes:

* Fixes and a quirk for DP training.
* Fix for DP-VGA adapters that report an analog display in EDID.
* Fixes for Skylake support with coreboot.
* DDI Buffer drive-strength configuration for Haswell, Broadwell and
  Skylake.
* `gfx_test` can now be run from X windows (with glitches).
* Compatibility with GCC 7 and SPARK GPL 2017.

TEST=Booted lenovo/t420 and verified that everything works as usual.

Change-Id: I001ba973d864811503410579fd7ad55ab8612759
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/20606
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/northbridge/intel/sandybridge/gma.c

@@ -648,8 +648,7 @@ static void gma_func0_init(struct device *dev)
 
 		int lightup_ok;
 		if (IS_ENABLED(CONFIG_MAINBOARD_USE_LIBGFXINIT)) {
-			gma_gfxinit((uintptr_t)mmiobase, graphics_base,
-				    physbase, &lightup_ok);
+			gma_gfxinit(&lightup_ok);
 		} else {
 			lightup_ok = i915lightup_sandy(&conf->gfx, physbase,
 					iobase, mmiobase, graphics_base);