provider/aws: allow ap-northeast-2 in region validation

[phinze]

Fixes #4635

[catsby]

Need [12]string I think, otherwise 👍

[phinze]

I'll see your [12]string{...} and raise you []string{...} 😁

[catsby]

❤️ to you @phinze but maybe #4637 is the one we should take 😄

[phinze]

Yep his is better 👍

[ghost]

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