Add missing annotations on https://cloud-provider-aws.sigs.k8s.io/service_controller/

[xunleii]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
This PR adds some missing annotations on the service controller annotations

Which issue(s) this PR fixes:

This PR can be related to #844 but is not enough to fix it

Special notes for your reviewer:
Without context, I don't know if it's just a simple oversight or if these annotations were forgotten for a specific reason.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

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[cartermckinnon]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cartermckinnon

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