Remove csi-driver-registrar flag

[mauriciopoppe]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Removes a flag introduced in https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/701/files# to the wrong container (it should only be in gce-pd-driver)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[mauriciopoppe]

/assign @mattcary
/assign @jingxu97

[mauriciopoppe]

/unassign @mattcary
/unassign @jingxu97
/cc @mattcary @jingxu97

[mattcary]

/ok-to-test
/approve
/lgtm

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattcary, mauriciopoppe

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