RTEMS | bsps/x86_64/amd64: Add a timecounter (!1405)

[Sebastian Huber (@sebhub)]

Sebastian Huber created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1405

Project:Branches: sebhub/rtems:up/x86_64-timecounter to rtems/rtos/rtems:main
Author:   Sebastian Huber



## Summary

Issue #5693: The timecounter cannot resolve a clock tick

One commit. It uses the time stamp counter, which is free running, and
calibrates it in the PIT window which already calibrates the Local APIC timer.

**BSP** `x86_64/amd64` · **Simulator** Qemu

## AI Details
<!-- Make sure you have read our statement at https://www.rtems.org/generative-ai/ -->

### Prompt used

None as a single prompt.  The work was done in an interactive Claude Code
session on the RTEMS tree.  The task was to run the test suites of the
simulator BSPs, diagnose every failure and fix the cause.  Each change was
directed and reviewed.

### AI model used

Claude Opus 5 (claude-opus-5), through Claude Code.

### How AI was used for the contribution

- [ ] Formatting
- [ ] Test creation.
- [x] Code comments.
- [ ] The entire contribution was generated using AI
- [ ] AI code completion such as Copilot in VSCode.

The diagnosis and the implementation were produced in that session under my
direction, and the commit messages were drafted there.

### Access

I have not used a product which claims copyright in its output, and I have
legitimate access to the one I used.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1405
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