RTEMS | griscv BSP variants fail to compile when SMP is enabled (#5784)

[Joel Sherrill (@joel)]

Issue created by Joel Sherrill: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5784



## Summary

This build failure is [reported](https://lists.rtems.org/pipermail/build/2026-September/077318.html) by the bsp-builder. It is all builds with SMP enabled. [config-riscv-griscv-smp.ini](/uploads/5f1f2e72d87fb9e2f420150b95d6b0b7/config-riscv-griscv-smp.ini) can be used to reproduce it.
```
../../../bsps/riscv/griscv/start/bspsmp.c: In function 'bsp_start_on_secondary_processor':
../../../bsps/riscv/griscv/start/bspsmp.c:45:23: error: 'irqamp' has no member named 'mask'; did you mean 'pimask'?
   45 |   GRLIB_IrqCtrl_Regs->mask[cpu_index_self] |= 1U << GRLIB_mp_irq;
      |                       ^~~~
      |                       pimask
../../../bsps/riscv/griscv/start/bspsmp.c: In function '_CPU_SMP_Send_interrupt':
../../../bsps/riscv/griscv/start/bspsmp.c:94:23: error: 'irqamp' has no member named 'force'; did you mean 'iforce0'?
   94 |   GRLIB_IrqCtrl_Regs->force[target_processor_index] = 1 << GRLIB_mp_irq;
      |                       ^~~~~
      |                       iforce0
../../../bsps/riscv/griscv/start/bspsmp.c:91:39: error: parameter 'target_processor_index' set but not used [-Werror=unused-but-set-parameter]
   91 | void _CPU_SMP_Send_interrupt(uint32_t target_processor_index)
      |                              ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Build failed
 -> task in '/bsps/riscv/griscv/objsmp' failed with exit status 1 (run with -v to display more information)
```


## Steps to reproduce

Build with the attached ini file.


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