Merge "Final IBluetoothHearingAid.aidl improvements" am: c12f1dc6 am: f1333b87

    int getConnectionState(in BluetoothDevice device);

    boolean setPriority(in BluetoothDevice device, int priority);

    int getPriority(in BluetoothDevice device);

    boolean adjustVolume(int direction);

    boolean setVolume(int volume);

    void adjustVolume(int direction);

    void setVolume(int volume);

    int getVolume();

    int getClientId(in BluetoothDevice device);

    const int HI_SYNC_ID_INVALID = 0;

    long getHiSyncId(in BluetoothDevice device);

    const int SIDE_LEFT = 0;

    const int SIDE_RIGHT = 1;