Peek wake timeout (2/2)
credits : CRdroid

- Allow user to set how long peek notification will hold screen on

- This is totally based on @LorDClockaN with very little adjustments. A big
Original commit: AICP/packages_apps_Settings@36674cc

Change-Id: I84e8120b50841f0d9e61d77739d6e4b3427ac091