Automatic merge from submit-queue (batch tested with PRs 58903, 58141, 58900). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Fix pod security policy capability test.

Fixes https://github.com/kubernetes/kubernetes/issues/58901.

In our document, we explicitly say:
```
The following fields take a list of capabilities, specified as the capability name in ALL_CAPS without the CAP_ prefix.
```
https://kubernetes.io/docs/concepts/policy/pod-security-policy/

@kubernetes/sig-node-pr-reviews 

**Release note**:
```release-note
none
```