Re-pin voltha/voltha-onos sha256

Change-Id: I56715e076ab96dad172876d7946ff0b7974f65fa
diff --git a/kubernetes-configs/voltha/tucson-pod.yml b/kubernetes-configs/voltha/tucson-pod.yml
index 06e9b4f..d80e27c 100644
--- a/kubernetes-configs/voltha/tucson-pod.yml
+++ b/kubernetes-configs/voltha/tucson-pod.yml
@@ -13,3 +13,8 @@
 # limitations under the License.
 
 # This file can be used to override values in kind-voltha's minimal-values.yaml
+
+images:
+  onos:
+    repository: voltha/voltha-onos@sha256
+    tag: 9f781ace4c6f4bf3b2e5ff9cb9f26aa4b328284da1d6b6523636dca1375d7666