Support for r6i instance type on AWS

1. Proposed title of this feature request
Support for r6i instance type on AWS

2. What is the nature and description of the request?
Memory optimized (R6i) Amazon EC2 instances offering up to 16% improvement in price performance versus comparable fifth generation instances. Hence there is demand to have r6i instance type supported and tested for Control-Plane as well as for workers

3. Why does the customer need this? (List the business requirements here)
Memory optimized (R6i) Amazon EC2 instances offering up to 16% improvement in price performance versus comparable fifth generation instances.

4. List any affected packages or components.

• Installer
• MachineAPI
• Documentation