Whilst the PReP specification describes how all PCI IRQs are routed via IRQ
15 on the interrupt controller, the real 40p machine has a routing quirk in
that the LSI SCSI device is routed directly to IRQ 13.

Enable the external IRQ for the LSI SCSI device by wiring up the IRQ with
qdev to the relevant interrupt controller gpio.
Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Acked-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NHervé Poussineau <hpoussin@reactos.org>
Tested-by: NHervé Poussineau <hpoussin@reactos.org>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>