aws: add ap-southeast-4 region

[jwitrick]

Description

Fix to add ap-southeast-4 region to support elb and nlb

Updated aws.go file for new region ap-southeast-4 . Added zone id for classic/application load balancer and Network load balancer

Fixes #3896

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jwitrick / name: Justin Witrick (c00a24a)

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[k8s-ci-robot]

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[johngmyers]

/ok-to-test
/lgtm
/assign @szuecs

[johngmyers]

A better commit and PR title would be "aws: add ap-southeast-4 region"

[jwitrick]

A better commit and PR title would be "aws: add ap-southeast-4 region"

I updated the title as per suggestion (sorry i was EOD for me on Friday).

Please let me know if there is anything else preventing htis from being merged.

[johngmyers]

/lgtm

[szuecs]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jwitrick, szuecs

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