update resizer sidecar rbac rules

[saikat-royc]

In kubernetes-csi/external-resizer#86, new permissions were add for the resizer to watch Pod events.

[saikat-royc]

/assign

[saikat-royc]

with fix for kubernetes-csi/external-resizer#88, we do not need to update rbac rules, if the feat is off.
If we want to enable the feat in future, we can re-open the issue.