This is needed to successfully build fox_wtm2 from external repo.
BUG=chrome-os-partner:18638
BRANCH=none
TEST=manual: successfully compile coreboot for fox_wtm2 and
create an image with chromeos-bootimage/cros_bundle_firmware
Change-Id: Iaa4e9983faa1d86c2b29d8fd4f577be035497e38
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/48676
Reviewed-by: Aaron Durbin <adurbin@chromium.org>