Remove default tags for Tucson pod, to allow installing releases

Change-Id: I4029f5b20b965f1a4fbab0a70d060c3a912a7f66
diff --git a/kubernetes-configs/voltha/tucson-pod.yml b/kubernetes-configs/voltha/tucson-pod.yml
index be6cbe0..6cbbf50 100644
--- a/kubernetes-configs/voltha/tucson-pod.yml
+++ b/kubernetes-configs/voltha/tucson-pod.yml
@@ -11,7 +11,3 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-defaults:
-  image_tag: master
-  image_pullPolicy: Always