Support IBM COS for PowerVS platform

Recently, the image registry team decided with this change[1] that major cloud platforms cannot have `emptyDir` as the storage backend. IBMCloud uses ibmcos, which we would ideally need to do. There have been few issues identified with using ibmcos as is in the cluster image registry operator and some solutions identified here[2]. Basically, we would need the PowerVS platform to be supported for ibmcos and an API related to change to add resourceGroup in the infra API. This only affects 4.13 and is not an issue for 4.12.

[1] https://github.com/openshift/cluster-image-registry-operator/pull/820

[2] https://coreos.slack.com/archives/CFFJUNP6C/p1672910113386879?thread_ts=1672762737.174679&cid=CFFJUNP6C