Fix rbac issue in cephfs plugin

remove unwanted rules and update
rbac to have permission to modify
endpoints and configmaps in the
current namespace.

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

deploy/cephfs/kubernetes/csi-attacher-rbac.yaml

@@ -10,9 +10,6 @@ apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: cephfs-external-attacher-runner
 rules:
-  - apiGroups: [""]
-    resources: ["events"]
-    verbs: ["get", "list", "watch", "update"]
   - apiGroups: [""]
     resources: ["persistentvolumes"]
     verbs: ["get", "list", "watch", "update"]