Merge "Hearing Aid: change get/set active device (1/3)" into pi-dev

    List<BluetoothDevice> getConnectedDevices();

    List<BluetoothDevice> getDevicesMatchingConnectionStates(in int[] states);

    int getConnectionState(in BluetoothDevice device);

    void setActiveDevice(in BluetoothDevice device);

    boolean isActiveDevice(in BluetoothDevice device);

    boolean setActiveDevice(in BluetoothDevice device);

    List<BluetoothDevice> getActiveDevices();

    boolean setPriority(in BluetoothDevice device, int priority);

    int getPriority(in BluetoothDevice device);

    void adjustVolume(int direction);