Add missing mount required to capture GPU metrics

[yadneshk]

Closes: OSPRH-11890

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[yadneshk]

/cherry-pick 18.0-fr1

[openshift-cherrypick-robot]

@yadneshk: once the present PR merges, I will cherry-pick it on top of 18.0-fr1 in a new PR and assign it to you.

In response to this:

/cherry-pick 18.0-fr1

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[jlarriba]

/lgtm

[openshift-cherrypick-robot]

@yadneshk: new pull request created: #828

In response to this:

/cherry-pick 18.0-fr1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.