Correct repo for adtran openolt image

Change-Id: Ibcd926320c243f4ebf6919f4c01049661e6598da
diff --git a/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml b/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml
index 8d8e672..96ad1f3 100644
--- a/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml
+++ b/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml
@@ -25,7 +25,7 @@
 images:
   adapter_adtran_olt:
     registry: "10.34.90.43:443/"
-    repository: ''
+    repository: "voltha-adtran-adapter"
     tag: "1.4.0"