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>