Bluetooth in band ring

Add a flag to the BluetoothHeadsetClientCall indicating the current
status of in band ring on the connected phone.

Bug: 65673832
Test: runtest bluetooth -c
com.android.bluetooth.hfpclient.HeadsetClientStateMachineTest

Change-Id: I7e839f2790b1a27d336528e93bc8a4c8d8ff3036
(cherry picked from commit f780364a9a1f6171860cbdf4e1b41a01ee7d88c6)