Revert "NavigationBar : Customization"

This reverts commit 61941dd7b5d04af790cbaa4f902bb352a4725783.

Conflicts:
	packages/SystemUI/res/layout/mid_navigation_bar_land.xml
	packages/SystemUI/res/values/cm_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarTransitions.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyButtonView.java

Change-Id: I365da18dfac52ce07a9edca4441fe59f2e101691