intel/skylake: remove the gpio_fsp.h usage as skylake boards move gpio

intel/skylake: remove the gpio_fsp.h usage as skylake boards move gpio
config to coreboot completely

BUG=None
BRANCH=None
TEST=Built and booted kunimitsu.
CQ-DEPEND=CL:295012

Change-Id: I78e16e8079c4ee0c4fa70cb7a74ba039ee89398f
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Original-Commit-Id: 6f1db1a2ffdbeb7dd21b4894f74d3feb44d69c49
Original-Change-Id: I8aafb0ef7d1b77cb8d386f4e73dc46ea3d8ee3a4
Original-Signed-off-by: robbie zhang <robbie.zhang@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/294758
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Tested-by: Wenkai Du <wenkai.du@intel.com>
Reviewed-on: http://review.coreboot.org/11426
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>