ARM: PCI: provide a default bus scan implementation

Most PCI implementations perform simple root bus scanning.  Rather than
having each group of platforms provide a duplicated bus scan function,
provide the PCI configuration ops structure via the hw_pci structure,
and call the root bus scanning function from core ARM PCI code.

Acked-by: Krzysztof Hałasa <khc@pm.waw.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-ixp4xx/ixdp425-pci.c

@@ -60,9 +60,9 @@ static int __init ixdp425_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 
 struct hw_pci ixdp425_pci __initdata = {
 	.nr_controllers = 1,
+	.ops		= &ixp4xx_ops,
 	.preinit	= ixdp425_pci_preinit,
 	.setup		= ixp4xx_setup,
-	.scan		= ixp4xx_scan_bus,
 	.map_irq	= ixdp425_map_irq,
 };