GUI2 added in the layout topo overlay

Change-Id: I9960f95ae726a5af9950771ed67bcfc9d172e267
diff --git a/core/api/src/main/java/org/onosproject/ui/model/topo/UiDevice.java b/core/api/src/main/java/org/onosproject/ui/model/topo/UiDevice.java
index b0622dd..15a0519 100644
--- a/core/api/src/main/java/org/onosproject/ui/model/topo/UiDevice.java
+++ b/core/api/src/main/java/org/onosproject/ui/model/topo/UiDevice.java
@@ -45,6 +45,7 @@
         checkNotNull(device, DEVICE_CANNOT_BE_NULL);
         this.topology = topology;
         this.deviceId = device.id();
+        this.regionId = RegionId.regionId(UiRegion.NULL_NAME);
     }
 
     /**