Show notification when charging.

    If user selects "Charging" option from
    USB computer conection, show the notification
    "Connected in charging mode", which will also
    prevent the pending intent from getting removed.
    CRs-Fixed: 641540

Change-Id: I93a04efe52e8280da95438ceb02b4054610a4d6e
Merge "    Show notification when charging." into du44