Begin using KubeVirt as the infrastructure platform instead of None

[davidvossel]

The machine-config-operator had some left over logic from the old KubeVirt IPI effort that broke the KubeVirt Hypershift platform. This caused us to have to temporarily report the None platform on the infrastructure object. Otherwise we'd get a bunch of coredns and other networking related changes layered in that are no longer relevant for kubevirt+hypershift.

I updated the mco here to strip out the old KubeVirt IPI logic but leave the KubeVirt platform intact. Now we can remove the weird workaround where we used none. This is important because it's needed for us to begin integrating logic into the cso for the kubevirt-csi driver install.

[openshift-ci]

@davidvossel: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-nested	45c50ab	link	false	/test e2e-aws-nested
ci/prow/e2e-kubevirt-gcp	45c50ab	link	false	/test e2e-kubevirt-gcp

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[enxebre]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidvossel, enxebre

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