Description of problem:

Starting with OCP 4.12, there is now a multi image arch supported by ACM (quay.io/openshift-release-dev/ocp-release:4.12.0-multi), which allows users to provision different cpu architecture for their node pools. However we only show one option in CPU architecture on the node pools:

Version-Release number of selected component (if applicable):

ACM 2.7.0-RC2

How reproducible:

everytime

Steps to Reproduce:

1. click create cluster
2. select ocp 4.12-multi image
3. go to node pools, see only 1 option (same architecture as hub)

Actual results:

Expected results:

1. Should show the different architectures supported by the multi imageset, and
2. Suggested instance types should be updated to match the same architecture selected for the managed cluster

Additional info: