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This doesn't fix the GPIO interrupt triggering during a higher priority
CPU task, but does fix rtic-monotonics. I am unsure how to fix the
former as PLIC_MX doesn't have a function like `cpu_intr_from_cpu_x` to
pend/unpend CPU interrupts, and if the CPU interrupts are enabled with
PLIC_MX instead of INTPRI then the MCU just hangs when there is a CPU
interrupt.
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