utils: fix guaranteed QoS blkio cgroup path

[huww98]

What type of PR is this?

/kind bug

What this PR does / why we need it:

In 18f98b1, we fixed burstable path, but guaranteed QoS does not follow this pattern, and is still wrong.

Which issue(s) this PR fixes:

Fixes 18f98b1

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @huww98. Thanks for your PR.

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[mowangdk]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huww98, mowangdk

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