Bluetooth Audio Policy APIs and HFP support integration

HFP android specific command protocol to implement android features.
Used this protocol to support the Audio Policy feature from the HFP
protocol. BluetoothDevice is the endpoint to invoke the feature and
later BLE Audio will also support it.

Bug: 235541516
Bug: 253059988
Test: atest BluetoothInstrumentationTests
Tag: #feature
Change-Id: I5fd6c7959a85104f2bb5e31809a0e250c2dd13d0