[Audiosharing] Impl "Listen with" row.

This row will show the currently connected and active LE buds. There
should be no more than one pair.

Bug: 308368124
Test: Manual
Change-Id: I281d7f7c6debaeb34b8206fe587cb776ea0eb0ec
diff --git a/res/xml/bluetooth_audio_streams.xml b/res/xml/bluetooth_audio_streams.xml
index ce7374b..206fb34 100644
--- a/res/xml/bluetooth_audio_streams.xml
+++ b/res/xml/bluetooth_audio_streams.xml
@@ -26,6 +26,11 @@
         android:icon="@drawable/ic_add_24dp"
         android:summary="@string/audio_streams_qr_code_summary" />
 
+    <Preference
+        android:key="audio_streams_active_device"
+        android:title="Listen with"
+        settings:controller="com.android.settings.connecteddevice.audiosharing.audiostreams.AudioStreamsActiveDeviceController" />
+
     <com.android.settings.connecteddevice.audiosharing.audiostreams.AudioStreamsProgressCategoryPreference
         android:key="audio_streams_nearby_category"
         android:title="@string/audio_streams_pref_title" />