Double tap to sleep on navigation bar [1/2]

Change-Id: I0ed91c8664fc2e52693114aa1a2b1bdc5bee0b0f

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
Merge branch 'kk-caf' of https://github.com/BrokenOs/frameworks_base into kk-caf