Fix cloudConfigSecretName behavior

[a13x5]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This fixes incorrect behavior of the cloudControllerManager.cloudConfigSecretName which makes usage of the secret impossible.

Which issue(s) this PR fixes:

Fixes #7188

Special notes for your reviewer:

Tested manually on my k8s cluster deployed on Azure (not AKS).

Does this PR introduce a user-facing change?

NONE

[linux-foundation-easycla[bot]]

• :x: - login: @a13x5 / name: Aleksei Sizov . The commit (99e2b5900540def412bc5a34daf51dacea83ec16) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

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[k8s-ci-robot]

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