[1/2] Statusbar: Make double tap gesture configurable

Change-Id: I6864f54bd4fa1616910135efd82015e9d8c08659

Observe double tap gesture setting changes

Change-Id: I51f0e909c1c62eb860297cbdf26cffdb92969a60

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java