HFP: Add method to disable inband ringing through BSIR (2/2)

* Add sendBsir(boolean, BluetoothDevice) to turn
  in-band ringtone feature ON and OFF dynamically during a service
  level connection with a headset
* Added missing mutex lock in native interface as well

Bug: 70173881
Test: make
Change-Id: I5e0744367c07d0448c72ce15fa6f60ffbd5f4995