Ceph requires all topology label being unique. And it is quite common to
have topology.kubernetes.io/region and topology.kubernetes.io/zone being set
to the same value. In this case, let's just ignore the region label.
See https://github.com/rook/rook/issues/9419#issuecomment-1144311818
Signed-off-by: Cheng XU <git@xuc.me>