Allow listeners to see children

Allow listeners to see notification children. Since L is not baked yet, keeping
this version check makes it difficult to test apps.

Bug: 16733244
Change-Id: I70afd6b99fc18c1f0b9188279c04fab80c37d414

services/core/java/com/android/server/notification/NotificationManagerService.java

@@ -2511,10 +2511,7 @@ public class NotificationManagerService extends SystemService {
         if (!listener.enabledAndUserMatches(sbn.getUserId())) {
             return false;
         }
-        Notification n = sbn.getNotification();
-        if (listener.targetSdkVersion < Build.VERSION_CODES.L && n.isGroupChild())  {
-            return false;
-        }
+        // TODO: remove this for older listeners.
         return true;
     }