RISC-V: simplify software interrupt / IPI code
Rename handle_ipi to riscv_software_interrupt, drop the unused return value and move the prototype to irq.h together with riscv_timer_interupt. This allows simplifying the upcoming interrupt handling support. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>
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