s390x architecture support for `oc mirror` plugin

1. Proposed title of this feature request
 s390x architecture support for `oc mirror` plugin

2. What is the nature and description of the request?
Provide a distribution of the "oc mirror" plugin for s390x architecture.

3. Why does the customer need this? (List the business requirements here)
The customer runs a disconnected OpenShift 4.11 on s390x architecture they are is required to only use officially supported methods/tools for image mirroring.

4. List any affected packages or components.

• OCP 4.11
• `oc` tools