ceph: csi controller to use constants to fetch operator configmap
ceph: csi controller to use constants to fetch operator configmap

The CSI controller loop watches ConfigMaps and CephClusters. When a
CephCluster triggers the reconcile loop, the Get call for the ConfigMap
will fail since the name in the request object is that of the
CephCluster. Setting the name and namespace to the constants for the
ConfigMap name and the operator namespace resolves this.

Closes: https://github.com/rook/rook/issues/8958
Signed-off-by: Renan Campos <e5c0415736c958f83fa23ae8bcc004300e4432f2@redhat.com>

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