OADP-4819: Add OKE as valid-subscription

[rayfordj]

https://issues.redhat.com/browse/OADP-4819

[openshift-ci-robot]

@rayfordj: This pull request references OADP-4819 which is a valid jira issue.

In response to [this](https://github.com/openshift/oadp-operator/pull/1513): >https://issues.redhat.com/browse/OADP-4819 Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Foadp-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rayfordj, shubham-pampattiwar, sseago, weshayutin

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/oadp-operator/blob/oadp-1.4/OWNERS)~~ [rayfordj,shubham-pampattiwar,sseago] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[openshift-ci[bot]]

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