RTEMS | RISC-V implementation does not support Smdbltrp extension (#5274)

[Matteo Concas (@matteo.concas)]

Matteo Concas commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5274#note_135546


A new issue was found with the current RISC-V implementation in #5383. When the ["Smrnmi" Extension for Resumable Non-Maskable Interrupts](https://docs.riscv.org/reference/isa/priv/rnmi.html#rnmi) is enabled with the Smdbltrp extension and a double exception is detected, the PC will be set to the address of the RNMI trap handler instead of the regular exception trap handler.

We should have a RNMI trap handler

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5274#note_135546
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