Umaro: add servo overlay

Inherit Strago servo overlay configuration since Umaro is based on Strago.

BUG=chrome-os-partner:49576
TEST=run 'cros_workon --host start hdctools'
         'sudo emerge hdctools'
         'sudo servod --board umaro'

Change-Id: Ib78c693e0a6c0d2cd8c71cc480db06300a8ecbc9
Signed-off-by: Kaiyen Chang <kaiyen.chang@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/323122
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
1 file changed