Allow RBAC permissions for leader election

[ccremer]

Summary

• Following the release of v1.2.0 (Error creating lock: endpoints lock is removed, migrate to endpointsleases #70 ), we also need to give RBAC permissions for leader election.

Checklist

• Categorize the PR by setting a good title and adding one of the labels:
  kind:bug, kind:enhancement, kind:documentation, kind:change, kind:breaking, kind:dependency
  as they show up in the changelog
• PR contains the label area:chart
• PR contains the chart label, e.g. chart:kubernetes-zfs-provisioner
• Variables are documented in the values.yaml using the format required by Helm-Docs.
• Chart Version bumped if immediate release after merging is planned
• I have run make chart-docs
• Link this PR to related code release or other issues.