Add bluetooth.audio@2.2 implementation

Bug: 201292721
Bug: 150670922
Bug: 197297498
Test: m android.hardware.bluetooth.audio@2.2-impl
Change-Id: I224b1e001337165e5191060f0ae532933a419b68
diff --git a/bluetooth/audio/utils/session/BluetoothAudioSession.h b/bluetooth/audio/utils/session/BluetoothAudioSession.h
index 83e20ad..3469cc0 100644
--- a/bluetooth/audio/utils/session/BluetoothAudioSession.h
+++ b/bluetooth/audio/utils/session/BluetoothAudioSession.h
@@ -80,6 +80,7 @@
 
 class BluetoothAudioSession {
   friend class BluetoothAudioSession_2_1;
+  friend class BluetoothAudioSession_2_2;
 
  private:
   // using recursive_mutex to allow hwbinder to re-enter agian.