use ControllerClientBuilder in k8s.io/cloud-provider for AWS/GCE cloud providers

[andrewsykim]

What type of PR is this
/kind cleanup

What this PR does / why we need it:
Use ControllerClientBuilder from k8s.io/cloud-provider where possible.

Does this PR introduce a user-facing change?:

NONE

/assign @cheftako
/sig cloud-provider

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andrewsykim

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• pkg/cloudprovider/providers/aws/OWNERS [andrewsykim]
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[micahhausler]

/lgtm

[andrewsykim]

/retest

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[k8s-ci-robot]

@andrewsykim: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-e2e-kops-aws	0cec135	link	/test pull-kubernetes-e2e-kops-aws

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