Setting: PA Clear all button

Conflicts:
	res/values/strings.xml
	res/xml/navigation_bar_settings.xml
	src/com/android/settings/simpleaosp/NavigationBarSettings.java

Change-Id: Ia33568dbf65e280b4a79c293665dc6804c03cb19
Fix Clear All

Change-Id: Ic10d8c531dc0d37c26e8d7b90b5cc112b94a3d43