Memory hot-(un)plug isn't supported on s390x

Always

Following the current documentationn https://docs.openshift.com/container-platform/4.18/virt/managing_vms/virt-edit-vms.html#virt-hot-plugging-memory_virt-edit-vms, if we update the memory from Virtualization Console for a s390x based VM, it keeps those changes in pending state with reason "Memory hotplug operation isn't supported in the current VM configuration". Also from virt-api logs, we can see that "Memory hot-plug is not supported on architectures other than arm64 and amd64"     

    No mention hot-(un)plug is supported of s390x arch

    Better we mention either in this section in a note or in release notes for 4.18 that memory hot-(un)plug isn't supported on s390x.