Bluetooth: PAN: Tethering code for Bluez solution

CRs-fixed: 444230
Change-Id: Ib18028fdab1e13ab191543e1afdcfa98e0846183
Bluetooth: Implementing finalize() method.

Added finalize() in BluetoothA2dp.java for
clean up in this method.

Change-Id: I4f23333db782f8d9fc6fadb41d0b33fbe694329a
CRs-Fixed: 443585