hammerhead: Use CM default overlays

- config_defaultNotificationLedOff
- def_screen_off_timeout

Change-Id: I07f11cf3f8fb4cdefb71d5a10b1b1b8ed88d7aca
Signed-off-by: Lorenzo M <djmesias@yahoo.es>
(cherry picked from commit df9a4f0da350eeed8a523f96e5df922f80cbbaaa)