CHERRY-PICK: Kefka: Add servo overlay for Kefka

Inherit Strago servo overlay configuration.

BUG=chrome-os-partner:53060
TEST=run 'cros_workon --host start hdctools'
         'sudo emerge hdctools'
         'sudo servod --board=kefka'

Change-Id: I0523cacc73b6773b279123c1f20ea47863078104
Original-Change-Id: I464a9ff0549974138222c79c983329fb9ce5c073
Reviewed-on: https://chromium-review.googlesource.com/343792
Tested-by: Huki Huang <huki.huang@intel.com>
Reviewed-by: Trevor Tsang <ttsang@google.com>
Commit-Queue: Huki Huang <huki.huang@intel.com>
1 file changed