Support Custom VM machine types in GCP on an OCP 4 install and when adding nodes

1. Proposed title of this feature request
Support Custom VM machine types in GCP on an OCP 4 install and when adding nodes

2. What is the nature and description of the request?
Support Custom VM machine types in GCP on an OCP 4 install and when adding nodes

3. Why does the customer need this? (List the business requirements here)
GCP has a future to track your actual VM usage. The customer would like to take advantage of this future and right-size the VMS with this information.

4. List any affected packages or components.
Install
node

https://cloud.google.com/custom-machine-types
https://cloud.google.com/compute/docs/instances/creating-instance-with-custom-machine-type