(factory-2338.B) Disable system time check.

Disable system time check as system time is not preserved across power
cycles. This fix is only for Lucas factory branch.

BUG=chrome-os-partner:9937
TEST=Manually run 'gooftool finalize'.

Change-Id: If2cba8ce92504f88390896fbcfed87e50907c3f3
Reviewed-on: https://gerrit.chromium.org/gerrit/23615
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Chinyue Chen <chinyue@chromium.org>