ide cs5520: Initialize second port's interrupt number.

In 86ccf37c

 the driver was modified
to deal with the removal of the pciirq argument to ide_pci_setup_ports().

But in the conversion only the first port's IRQ gets setup.

Inspired by a patch by Bartlomiej Zolnierkiewicz., and with help from
Alan Cox.

Signed-off-by: David S. Miller <davem@davemloft.net>