update cache logic to calculate chunk size based on total cache

[Sneha-at]

What type of PR is this?

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/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Updates the logic to calculate chunk size for data cache
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Updates the logic to calculate chunk size for data cache

[k8s-ci-robot]

@Sneha-at: 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
pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2019	884b472	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2019

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[Sneha-at]

/cherry-pick release-1.17

[k8s-infra-cherrypick-robot]

@Sneha-at: once the present PR merges, I will cherry-pick it on top of release-1.17 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.17

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[sunnylovestiramisu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Sneha-at, sunnylovestiramisu

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[k8s-infra-cherrypick-robot]

@Sneha-at: new pull request created: #2040

In response to this:

/cherry-pick release-1.17

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