Document BYO security groups for EKS-managed clusters

[adammw]

/kind documentation
/area provider/eks

Describe the solution you'd like
The Bring your own infrastructure docs describe how to set up security group overrides for self-managed clusters, but the keys used for EKS-managed clusters are not documented. Add a page under the EKS support page describing how to bring your own security groups, what the keys represent, etc.

[Ankitasw]

/triage accepted
/priority important-soon

[adammw]

For whoever writes the documentation, node-eks-additional was the key we needed to use to attach the custom security group to the EKS control plane under the "Additional security groups" heading instead of one being created by CAPI. Not sure which other keys are supported, I wasn't able to influence "Cluster security group" at all as I believe that one is created by AWS.

[Ankitasw]

Thanks @adammw, if you have bandwidth, feel free to contribute on the same.

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