Tinted system bars: add color switching ability to carrier label

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/CarrierLabel.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

Change-Id: Ie9bc03bb6368d6a5477536a7a9a5d2499108bbbe