[AudioStream] Hysteresis mode support

Flag: com.android.settingslib.flags.audio_sharing_hysteresis_mode_fix
Test: atest com.android.settings.connecteddevice.audiosharing.audiostreams
Test: manual test with broadcast hysteresis mode
Bug: 355222285
Bug: 355221818
Change-Id: If3a1fbdc391eeda6979868829bc00c435a43c329