Sentry: Add the servo overlay for Sentry

Inherit Kunimitsu servo overlay configuration since Sentry is based on Kunimitsu.

BUG=chrome-os-partner:48945
TEST=run 'cros_workon --host start hdctools'
	'sudo emerge hdctools'
	'sudo servod --board=sentry'

Change-Id: I39902b530002dbe4d99b360c8b16062d69a96316
Signed-off-by: Grace Kao <grace.kao@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/320074
Reviewed-by: Shawn N <shawnn@chromium.org>
1 file changed