Navigation bar custom height

Conflicts:
	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Change-Id: I9ca00129929364bcbd7d6ea11b6d4220543303e4

Conflicts:
	packages/SystemUI/res/layout/navigation_bar.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java