Merged IPI_IRQ_WORK & IPI_COMPLETION to arch/arm/kernel/smp.c

https://github.com/torvalds/linux/commit/5135d875e1457ef946a055003d8f80713e862135
https://github.com/torvalds/linux/commit/bf18525fd793101df42a1344ecc48b49b62e48c9