AWS UPI docs: remove control plane machineset

[patrickdillon]

64665eb added a control plane machineset manifest. This updates corresponding UPI docs to remove this manifest when the cluster is runnning without MAO.

/cc @JoelSpeed
/cc @rna-afk

[patrickdillon]

Corresponding CI fix is here: openshift/release#32287

[JoelSpeed]

/lgtm

[sadasu]

/approve

[openshift-ci]

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 5ad243a and 2 for PR HEAD 6d28403 in total

[r4f4]

/skip

[openshift-ci]

@patrickdillon: 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-ovn-proxy	6d28403	link	false	/test e2e-aws-ovn-proxy
ci/prow/e2e-aws-ovn-shared-vpc	6d28403	link	false	/test e2e-aws-ovn-shared-vpc
ci/prow/okd-e2e-gcp-ovn-upgrade	6d28403	link	false	/test okd-e2e-gcp-ovn-upgrade

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 36e5ac3 and 1 for PR HEAD 6d28403 in total