Add gardener/aws-ipam-controller to renovate automation

[domdom82]

How to categorize this PR?

/kind task

What this PR does / why we need it:

• Renovate config with auto-merge was added here
• Adding gardener/aws-ipam-controller to renovate/gardener-ci automation to automate dependency updates and migrate off dependabot in a separate step.

[gardener-prow]

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[oliver-goetz]

You could also add the prow job which validates the renovate config in PRs for this repo (see https://github.com/gardener/ci-infra/blob/master/config/jobs/common/renovate-presubmits.yaml)