Fix nested-overlayfs POSIX ACL tests (recursive lockdep issue)
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type: bug
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Description
### Description
The overlayfs locks need to be adjusted to properly handle the lock recursion that happens with overlayfs-on-overlayfs.
This will allow two tests, SetACLThroughStackedOverlay and GetACLThroughStackedOverlay, to be re-enabled.
Note that this issue is solely an issue with lockdep enabled (our syscall tests + syzkaller). It is not reachable in a production gVisor build.
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