Update tile limit for Sound settings.

Pull the notification and alarm ringtone out of the preference category
and update the tile limit to 1, so that only the first preference
category will be displayed initially.

Change-Id: I9ae7669fb2b688560a3fc228274ea44f225b262f
Fixes: 67750626
Test: visual

src/com/android/settings/notification/SoundSettings.java

@@ -57,7 +57,7 @@ public class SoundSettings extends DashboardFragment {
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
-        mProgressiveDisclosureMixin.setTileLimit(6);
+        mProgressiveDisclosureMixin.setTileLimit(1);
     }
 
     @Override