Remove ChunkSizeMib featuregate

[deepsm007]

/cc @flavianmissi

wait for openshift/api#2438

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: deepsm007
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[openshift-ci]

@deepsm007: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn	641b9d7	link	true	/test e2e-aws-ovn

Full PR test history. Your PR dashboard.

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