Revert "[WIP][1/2] NavigationBar Customization [DO NOT PICK]"

This reverts commit ca77e962fbb84b10814d3cc9566bef26777e8c92.

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/values/pa_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavbarEditor.java