RTEMS | bsps/riscv: Accept the maximum external interrupt (!1552)

[Yadi choudhary (@yadi)]

Yadi choudhary created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1552

Project:Branches: yadi/rtems:riscv-plic-last-source to rtems/rtos/rtems:main
Author: Yadi choudhary

## Summary

bsps/riscv: Accept the maximum external interrupt

RISCV_MAXIMUM_EXTERNAL_INTERRUPTS is the highest PLIC interrupt source
number, and source numbers start at one.  The vector table had no slot
for the maximum source and bsp_interrupt_is_valid_vector() rejected it.
On the QEMU virt machine (riscv,ndev = 95), installing a handler for
source 95 failed with RTEMS_INVALID_ID.

Add a vector for the maximum source and accept it as valid.  Use the
masked dispatch only if the maximum plus one is a power of two, and mask
with the maximum.  Otherwise, the source equal to the maximum would wrap
to vector zero.

Close #5791.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1552
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