Simplify DeviceChip population logic in MediaDeviceManager

The device chip's should be populated with one unique source to avoid
incongruent states (e.g. icon representing a different device than
name). We can rely now on LocalMediaManager to provide the right
connected device based on PlaybackInfo.

Also, SASS devices should override the Device Chip only when the
PlaybackInfo is not set to PLAYBACK_TYPE_REMOTE.

Bug: 333564788
Test: Manual + adb shell cmd statusbar media-mute-await 4 ble-headset
start
Flag: com.android.settingslib.media.flags.use_playback_info_for_routing_controls

Change-Id: I25ebfa627da5165900e78df10ede0e706bd3e24a