LibBSD | Adapt to the new watchdog token and fix a related problem in libbsd (!169)

[Christian Mauderer (@c-mauderer)]

Christian Mauderer created a merge request: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/169

Project:Branches: c-mauderer/rtems-libbsd:cm/7-adapt-watchdog-token to rtems/pkg/rtems-libbsd:7-freebsd-14
Author: Christian Mauderer
Assignee: Christian Mauderer

## Summary

The MR https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1481 added a new watchdog token. This MR adapts to that API change.

Aditionally it fixes a bug that is related to the one in RTEMS that made the watchdog token necessary. Basically the following (also in the commit message):

On SMP, this order of events was possible:
    
1. Processor A: The timeout expired. The tick removed it from the list of pending timeouts.
    
2. Processor B: A wakeup ended the sleep. The thread tried to cancel its timeout, but the tick already removed it.
    
3. Processor B: The thread began its next sleep.
    
4. Processor A: The tick called sleepq_timeout() for the old timeout. The routine saw a sleeping thread and ended the next sleep.
    
The next sleep then returned EWOULDBLOCK, although its own timeout did not expire.

## Generative AI

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None as a single prompt. Interactive Claude Code session: run the simulator test suites, diagnose each failure and fix the cause. I directed and reviewed every change.

### AI model used

Claude Opus 5 and Claude Sonnet 5.5, through Claude Code.

### How AI was used for the contribution

* ( ) Formatting
* (x) Test creation.
* (x) Code comments.
* (x) The entire contribution was generated using AI
* ( ) AI code completion such as Copilot in VSCode.

The code was written under heavy guidance done by me and of course I reviewed it myself.

### Access

I have legitimate access to the tool, and it claims no copyright in its output.

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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/169
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