Remove the CgroupModeV1 config option from the openshift/api repository
Ref: https://github.com/openshift/api/blob/master/config/v1/types_node.go#L84 

Add a CRD validation check on the CgroupMode field of the nodes.config spec to avoid the update to "v1" and only allow the "v2" and "" as valid values.

Latest update:
Raise a PR with the updated enhancement proposal to handle the removal of cgroupsv1