RTEMS | bsps/dev/irq/arm-gic: Document the GICD_IROUTER offset (!438)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/438

Project:Branches: opticron/rtems:BRmain-document-irouter to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

bsps/dev/irq/arm-gic: Document the GICD_IROUTER offset

The GICD_IROUTER register technically starts at offset 0x6000, but the
first 32 IRQ entries are reserved making IRQ 32's entry at 0x6100 the
first usable entry. This register is not currently used, so only a
comment is added to that effect.

Closes #5223


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