Fix file name for zyxel xgspon olt configuration file

Change-Id: Ie2aa4951532cb17438b9bafdb120ab751d371fde
diff --git a/kubernetes-configs/voltha/berlin-community-pod-2-xgsgpon-zyxel.yml b/kubernetes-configs/voltha/berlin-community-pod-2-xgspon-zyxel.yml
similarity index 100%
rename from kubernetes-configs/voltha/berlin-community-pod-2-xgsgpon-zyxel.yml
rename to kubernetes-configs/voltha/berlin-community-pod-2-xgspon-zyxel.yml