update Helm's deployment spec

[Huang-Wei]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

It's better using args to specify arguments only. The command is already specified in the Docker image.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Huang-Wei

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[Huang-Wei]

/cherrypick release-1.29

[k8s-infra-cherrypick-robot]

@Huang-Wei: new pull request created: #781

In response to this:

/cherrypick release-1.29

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