The controller should support instance type lookup during runtime for Windows support

**What would you like to be enhanced**:
Currently this controller has to maintain a file to list all supported EC2 instance instead of looking up at runtime. The reason is APIs for interface trunking is not public available yet. This is blocking to onboard the runtime support for trunk interface, but should not block Windows instance type lookup during runtime.
**Why is the change needed and what use case will it solve**:
Windows users will not be blocked when they need to create nodes on latest EC2 instance types.