Fix values.yaml default values for controller.podLabels

[bart-braidwell]

Is this a bug fix or adding new feature?
bug fix

What is this PR about? / Why do we need it?
There was an error in controller default values for deployment, instead of podLabels - that are referenced in deployment.yaml, there is an example of podLabel (missing "s") that might be misleading

What testing is done?
Helm release using default value for podLabel - is not adding any pod Labels, replacing podLabel with podLabels is working fine.

[linux-foundation-easycla]

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[k8s-ci-robot]

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