Caroline: Add the servo overlay

Inherit GLaDOS configuration and enable access to USBPD

BUG=none
TEST='cros_workon --host start hdctools'
     'sudo emerge hdctools'
     'sudo servod --board=caroline'

Change-Id: I43acbe29b233b3d271699d3e1e592ed467b88bf5
Signed-off-by: Ryan Lin <ryan.lin@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/394508
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
2 files changed