MGMT-15919: If day1 cluster is ARM cpu arch, then only ARM nodes can be added in Day2 - followup

[ammont82]

Related to https://issues.redhat.com/browse/MGMT-15919

If day1 cluster is ARM cpu arch, then only ARM nodes can be added in Day2:

Other options in dropdown are disabled:

[openshift-ci-robot]

@ammont82: This pull request references MGMT-15919 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.15.0" version, but no target version was set.

In response to [this](https://github.com/openshift-assisted/assisted-installer-ui/pull/2440): >Related to https://issues.redhat.com/browse/MGMT-15919 > >If day1 cluster is ARM cpu arch, then only ARM nodes can be added in Day2: > > >Other options in dropdown are disabled: > > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ammont82, jgyselov, jkilzi

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[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.