Support showing carrier/provider logo on statusbar [1/2]

- Added Toggle for users that don't like this feature
- Fixed icon size to match other statusbar icons so it doesn't look out of place

Change-Id: I98e70258af574ba42d0aa58853bf531e575f8d13

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/SignalClusterView.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java