CHERRY-PICK: Bob: Add the servo overlay

Inherit gru configuration.

BUG=chrome-os-partner:58795
TEST='cros_workon --host start hdctools'
     'sudo emerge hdctools'
     'sudo servod --board=bob'

Change-Id: I6b84cb7d6d64ac2576606b6834dc8031145aedca
Signed-off-by: Shasha Zhao <Sarah_Zhao@asus.com>
Reviewed-on: https://chromium-review.googlesource.com/409811
Reviewed-by: Philip Chen <philipchen@chromium.org>
(cherry picked from commit 837d0d58f9042e65b6af5bce49abf8d11dbcd813)
Reviewed-on: https://chromium-review.googlesource.com/411620
1 file changed