Bluetooth: Update Signal strength

This change makes sure that signal
strength is updated properly when
there is no network service.

Change-Id: I8f2e9fedc4ac6f0d039c55d8211ed96fbe25317d
MAP: Set Empty name or address for unknown values in GetMessageListing.

Set Empty sender or recipient name and address values to indicate
info not available from MSE in GetMessageListing response.
Current implemenation to skip the entire feild in response doesnot
mark the uniformity for values being fetched from telephony or
phone book databases.

Change-Id: I44e2f61572607349ec20ec1efcc6c44abe084b83
OPP: Handle intent receiver leak for BT TURN OFF.

Mark INBOUND and OUTBOUND active transfer as cancelled
on BT TURN OFF.

Change-Id: I52e6d59ba56e004af2dc25b85975dfeb6c19320a
PBAP: Remove initialisation of Missed calls number

Thic change will remove initialisation of Missed calls number
at the time of connection as NewMissedCall number indicates the
number of missed calls that have been received on the PSE since
the last PullPhoneBook request on the mch folder, at the point
of the request.

Change-Id: I5f769011a34cfe8e7225fca646a58451639dcfa5