Fix driver name as per CSI spec

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

deploy/cephfs/helm/templates/provisioner-statefulset.yaml

@@ -52,11 +52,13 @@ spec:
             - "--nodeid=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"
             - "--v=5"
-            - "--drivername=csi-cephfsplugin"
+            - "--drivername=$(DRIVER_NAME)"
             - "--metadatastorage=k8s_configmap"
           env:
             - name: HOST_ROOTFS
               value: "/rootfs"
+            - name: DRIVER_NAME
+              value: {{ .Values.driverName }}
             - name: NODE_ID
               valueFrom:
                 fieldRef: