Update output switcher behavior and UI design

- Remove media stream stuff, use active device info as header.
- Show the sub title of media device.
- Add new requirement, when user click disconnected bluetooth device,
  will auto connceted it.
- When bluetooth state is off, do not showing content of slice.

Bug: 127201385
Test: make -j42 RunSettingsRoboTests
Change-Id: Ie1880ba3ef9910a42caf0cca2b6502e54787f5a0

src/com/android/settings/media/MediaDeviceUpdateWorker.java

@@ -70,7 +70,7 @@ public class MediaDeviceUpdateWorker extends SliceBackgroundWorker
 
     @Override
     public void close() {
-
+        mLocalMediaManager = null;
     }
 
     @Override