support china efs dns names

[stoehdoi]

EFS in now GA in AWS China. However, EFS DNS names in respective regions end with .cn which is currently not supported. This PR adds support for china AWS regions.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[nikhita]

Thanks for your PR!

We are in the process of archiving this repo and are no longer accepting new PRs. Please see kubernetes/org#1563 for more details. Thanks again!