Add g6 EC2 instance type for AWS

[ceuity]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Enables the use of g6 families instances in node groups

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

• ✅login: ceuity / (d5a8e20)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @ceuity. Thanks for your PR.

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[gjtempleton]

/ok-to-test

[gjtempleton]

Thanks for this!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ceuity, gjtempleton

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Needs approval from an approver in each of these files:

• cluster-autoscaler/cloudprovider/aws/OWNERS [gjtempleton]

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