[parisc-linux] SuckyIO support

[Alan Cox]

> > Why are you reading this out of a register? Which register?
> 
> I'm reading it out of the INTERRUPT_LINE register because that's how
> 'normal' PCI devices set their dev->irq value.  If you say that's the
> right approach, I believe you.

INTERRUPT_PIN is pre-PCI plumbing view of the interrupt
INTERRUPT_LINE is sort of the PCI view of the interrupt at best
pci_dev->irq is the Linux view post all the plumbing and host goo