Claude review: MAINTAINERS: serdev: Add self for serdev

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Patch Review

```diff
-M:	Rob Herring <robh@kernel.org>
+M:	Markus Probst <markus.probst@posteo.de>
```

This replaces Rob as maintainer entirely rather than adding Markus as co-maintainer. The commit message references Rob's message about needing someone else to maintain serdev. This seems like a significant ownership change that Rob should explicitly Ack.

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**Summary of key issues:**

1. **Bug (Medium):** `Timeout::Max` maps to 0 which is incorrect for `wait_until_sent` — it would mean "don't wait" instead of "wait forever".
2. **Typo:** "partiy" in `Parity::Even` doc comment.
3. **Broken doc link:** `[ Device::wait_until_sent`]` in `write` method docs.
4. **Design question:** `unwrap_or_default()` silently converting overflow to 0 (infinite timeout) in `Timeout::into_jiffies`.
5. **Minor:** `ssize_t` to `i32` truncation in `write_all` error check path.
6. **Process:** MAINTAINERS change replacing Rob entirely should have his explicit Ack.

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