Update media output bar behavior when audio sharing

1. The media output bar will be unclickable.
2. Device name will become "Sharing Audio".

Flag: com.android.settingslib.flags.enable_le_audio_sharing
Test: manual on phone when audio sharing
Bug: 336183611
Change-Id: Ifed6a143b888924e5747a0462db04a7e6d277d09