Ultima: Add servo overlay for ultima

Inherit Strago servo overlay configuration.

BUG=chrome-os-partner:43821
TEST=run 'cros_workon --host start hdctools'
         'sudo emerge hdctools'
         'sudo servod --board=ultima'

Change-Id: I75427aefa1d48ab204f479bd3785a92f667f891e
Reviewed-on: https://chromium-review.googlesource.com/293165
Tested-by: Keith Tzeng <keith.tzeng@quantatw.com>
Reviewed-by: Shawn N <shawnn@chromium.org>
Commit-Queue: Keith Tzeng <keith.tzeng@quantatw.com>
1 file changed