The function cpu_raise_softirq() takes a softirq number, and a cpu number,
but cannot be used with cpu != smp_processor_id(), because there's no
locking around the pending softirq lists.  Since noone does this, remove
that arg.

As per Linus' suggestion, names changed:
	raise_softirq(int nr)
	cpu_raise_softirq(int cpu, int nr) -> raise_softirq_irqoff(int nr)
	__cpu_raise_softirq(int cpu, int nr) -> __raise_softirq_irqoff(int nr)