[release-4.19] Add ocp-sustaining team members to OWNERS

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1124

/assign kunalmemane

/cherrypick release-4.18 release-4.17 release-4.16 release-4.15 release-4.14 release-4.13 release-4.12

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[zeeke]

/lgtm
/approve
/label backport-risk-assessed
/verified bypass

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[SchSeba]

Hi @kunalmemane,
please open one bug for all the repos so we can use that on the backports.
Thanks!