Updates to conversation page

- Make info preference not selectable
- remove dividers

Test: manual
Fixes: 189414449
Change-Id: I081cea0d51fbc2d1c54ac392cee88a5750985fce

src/com/android/settings/notification/app/PriorityConversationsPreferenceController.java

@@ -55,6 +55,7 @@ public class PriorityConversationsPreferenceController extends
         Preference pref = new Preference(mContext);
         pref.setOrder(1);
         pref.setSummary(R.string.important_conversations_summary_bubbles);
+        pref.setSelectable(false);
         return pref;
     }