Overlay: Add ambient mode for hammerhead

Change-Id: I9a879a7741dbaf7a9a4519fb23ad7be702ba9de0
hammerhead: disable DOZE feature by default

user can enable it if they want it

Change-Id: Ia2a32f8827b21d567405dc86e28b88c71e074294
hammerhead: reenable notification and battery light overlays

Change-Id: I2f52ef61042f6d240cc798d45226e257e17401b9
Merge remote-tracking branch 'origin/lp5.0' into lp5.0

Conflicts:
	overlay/frameworks/base/core/res/res/values/config.xml

Change-Id: Id600ad0448c2a2ad89a3e3e7b2a158bf201e4756