Rook needs to be able to watch all `ceph.rook.io` resources to reconcile
them; however, it does not need blanket verb privileges. Reduce the
privileges as much as possible.
Ideally, Rook would only have update permissions to status and
finalizers of resources; however, finalizers are not a full-fledged
subresource at this time, and "update" permissions must be maintained
for `ceph.rook.io` resources.
Signed-off-by: Blaine Gardner <blaine.gardner@redhat.com>