Revert to multiarch distroless base image

[namrata-ibm]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/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: Support for s390x/ppc64le has been added to distroless static/base images and hence the Dockerfiles can go back to using multiarch images.

Which issue(s) this PR fixes:

Fixes # kubernetes-csi/csi-release-tools#105

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Changing distroless image back to multiarch

[k8s-ci-robot]

Hi @namrata-ibm. Thanks for your PR.

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[jsafrane]

/ok-to-test

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: namrata-ibm, xing-yang

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