std: sys: fs: uefi: Implement set_times and set_perm

[Ayush1325]

• Tested on QEMU OVMF.

[rustbot]

r? @Mark-Simulacrum

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[Ayush1325]

@rustbot label +O-UEFI

[bors]

☔ The latest upstream changes (presumably #149560) made this pull request unmergeable. Please resolve the merge conflicts.

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[rust-log-analyzer]

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