remove loggedDeprecationWarnings from VolumePluginMgr

[carlory]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

cleanup unused fields after #112723 was merged.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carlory
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[carlory]

/cc @dims