libsel4simple-default,riscv: implement irq_trigger #78
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Wire up simple->irq_trigger to seL4_IRQControl_GetTrigger on risc-v. This allows risc-v drivers in libplatsupport to register edge-triggered interrupts.
Purpose: Ready to merge
Context: Needed for the star64 timer driver that will be in libplatsupport
Testing performed: Tested on a WIP version of sel4test for the star64 platform on pinetab-v hardware