ARM: Versatile: fix section mismatch

WARNING: vmlinux.o(.text+0xbf38): Section mismatch in reference from the function pci_versatile_scan_bus() to the function .devinit.text:pci_scan_bus_parented()
The function pci_versatile_scan_bus() references
the function __devinit pci_scan_bus_parented().
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-versatile/pci.c

@@ -304,7 +304,7 @@ int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
 }
 
 
-struct pci_bus *pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
+struct pci_bus * __init pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
 {
 	return pci_scan_bus(sys->busnr, &pci_versatile_ops, sys);
 }