Eleven: Set audio attribute usage

Audio will not automatically reroute to Android Auto
without this

Change-Id: Ib76275a6d99f2d4991b4228173fbf75d659248c6
diff --git a/src/org/lineageos/eleven/MusicPlaybackService.java b/src/org/lineageos/eleven/MusicPlaybackService.java
index 298d222..8577b8a 100644
--- a/src/org/lineageos/eleven/MusicPlaybackService.java
+++ b/src/org/lineageos/eleven/MusicPlaybackService.java
@@ -743,6 +743,7 @@
     private void setUpMediaSession() {
         mAudioAttributes = new AudioAttributes.Builder()
                 .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+                .setUsage(AudioAttributes.USAGE_MEDIA)
                 .build();
         mAudioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
                 .setAudioAttributes(mAudioAttributes)