RTEMS | bsps/grlib: Fix IRQAMP MPSTAT register mask (!1118)

[Ahmed Mansour (@Mansour)]

Ahmed Mansour created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1118

Project:Branches: Mansour/rtems:irqamp-mpstat-mask-fix to rtems/rtos/rtems:main
Author:   Ahmed Mansour



## Summary

bsps/grlib: Fix IRQAMP MPSTAT register mask

The MPSTAT status field is 16 bits according to the GRLIB IP Core Manual.

Closes #5506


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