RTEMS | testsuites/validation: Resolve compiler warnings and simulator failures (!1163)

[Karthikey Kadati (@karthikey_kadati)]

Karthikey Kadati created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1163

Project:Branches: karthikey_kadati/rtems:fix-unrelated-warnings to rtems/rtos/rtems:main
Author:   Karthikey Kadati



## Summary

During FMLP validation testing with GCC 15, I hit a few -Werror breaks and a simulator assertion in some pre-existing tests.

This MR synchronizes the generated test code with the upstream spec fixes from the central tools repo to get the validation suite passing cleanly again on SMP simulators:

1. Fixed `-Wshift-negative-value` in tc-timecounter-install. (Shifting a negative int is UB in C11, so the spec was updated to shift the positive value and negate after).
2. Fixed `-Wsign-compare` in tr-event-send-receive (mismatch between int and States_Control).
3. Fixed the expected maximum priority assertion for the EDF SMP scheduler in tc-scheduler-smp-only (simulator natively caps at 255, not INT_MAX).

Depends on rtems-central MR:

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1163
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