Revert "Merge Navigation Bar and Pie Controls button config (1/2)"

This reverts commit 1c601ac8dde76d68e3824191e675256b47e0493f.

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/NavigationButtons.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavbarEditor.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyButtonView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/PieController.java