Revert "Overlay: Add ambient mode for hammerhead"

This reverts commit fe1923c6917df5229f5b3a22c7435d2eb78b7170.

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

Change-Id: I9a1063f24f2d1e1500844204d1a9dbe09314d466
Enable Ambient Display

This will make Ambient Display to appears on Settings and works on hammerhead.

Change-Id: I58a511b3bd0d6a5041240c22af5466f59211461c