Patch: AWS additionalSecurityGroups

[dkoshkin]

Add AWS additionalSecurityGroups configuration AWSMachineTemplates:

apiVersion: cluster.x-k8s.io/v1beta1
kind: Cluster
metadata:
  name: <NAME>
spec:
  topology:
    variables:
      - name: clusterConfig
        value:
          controlPlane:
            aws:
              additionalSecurityGroups:
                - sg-1
                - sg-2
      - name: workerConfig
        value:
          aws:
            additionalSecurityGroups:
              - sg-1
              - sg-2