CellBroadcastReceiver: Change CheckBoxes to Switches and add back button in action bar

to be consistent with all the other settings

Change-Id: Iefaa36c762500e8447d7621823a361c2ad2a8fc7

Conflicts:
	src/com/android/cellbroadcastreceiver/CellBroadcastSettings.java
CellBroadcastReceiver: use same insets like settings

looks better

Change-Id: I144c2bf54526ac1fa210cbe40c23d6d086bcacda