skylake: add support for verstage

The right files just need to be added to the verstage
build. Do that so a stand alone verstage builds and
links.

BUG=chrome-os-partner:44827
BRANCH=None
TEST=Built and booted glados.

Change-Id: I2d0c98760494e2f4657ee35b6f155690939d2d18
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11827
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
3 files changed