PBAP: Fix device name update on authorization prompt from Notification.

Use FLAG_ONE_SHOT for Notification PendingIntent to launch
authorization prompt and display the updated device name for
every new PBAP connection request.

Change-Id: Ic9cbed92e2856ed2d2f4f807f7f8c39df7f98762
CRs-fixed: 515221
Bluetooth : Remove out of range devices after ScanComplete

Change to remove device from UI when Bluetooth of remote
device is off or not discoverable anymore. Without this
change a device that discovered previously is available
in available devices list always, though the remote device
is not discoverable anymore. The current change updates
available devices list on scan complete removing the
devices that are available in cached devices and are not
disvorable anymore.

Change-Id: I97809fcafd904271121e26741e50a9b61f0e0664