RTEMS | rtems_test_spin_for_ticks() fails to execute a minimum workload (#5575)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5575



## Summary
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The test helper `rtems_test_spin_for_ticks( rtems_interval ticks )` is used in a few places where it is assumed that it executes for at least `ticks` CPU time. However, the function will not execute a complete tick the first time it is called except by some chance. When the rounding error is less than the function's overhead, the minimum workload of `ticks` time is not achieved.

## Steps to reproduce

This results in failures especially on simulators, I have seen it crop up in `sp69` running risc-v with s-mode in qemu.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5575
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