Fix default value for Berlin adtran

Change default for global so its the same as other files

Change-Id: Iec6e56f8dc191a35aa3dec9c0106b5129d2f36b1
Signed-off-by: Amaia <amaia.depablo@bisdn.de>
diff --git a/kubernetes-configs/voltha/berlin-community-pod-1-gpon-adtran.yml b/kubernetes-configs/voltha/berlin-community-pod-1-gpon-adtran.yml
index 6a1dab3..1e8dba3 100644
--- a/kubernetes-configs/voltha/berlin-community-pod-1-gpon-adtran.yml
+++ b/kubernetes-configs/voltha/berlin-community-pod-1-gpon-adtran.yml
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-defaults:
+global:
   image_tag: master
   image_pullPolicy: Always