[1/2] Base: Navigation bar height/width

All credits to SlimRoms / kufikugel

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

Change-Id: I97af1fbd5a2e7df2337abc6c825b4905f576a48b

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