Add CellBroadcastReceiver

Adds back cellbroadcastreceiver.apk to allow weather and other alerts to be
received

Change-Id: I223229f29fa2ab71b6aeac1d0acded9e90e8298a
Merge "Add CellBroadcastReceiver" into jb-mr1
Merge remote-tracking branch 'aokp/jb-mr1' into jb-mr1