Framework: Forward port Battery light support and fixes

Change-Id: Ic81d3ffb7548c7b7e34ffecd2f9db781f13b705d
Forward port Status Bar interface

Patch Set 1: Signal / Clock / Battery / Notification Count
Patch Set 2: Updated commit message

Change-Id: Iecd4bb06b95b14888916331f5d36327f3206aeef

Conflicts:
	packages/SystemUI/res/values/strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/StatusBarIconView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryController.java

Conflicts:
	packages/SystemUI/res/values/strings.xml