[MIPS] IP27: Export symbol pcibus_to_node to modules.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/pci/pci-ip27.c

@@ -205,6 +205,7 @@ int pcibus_to_node(struct pci_bus *bus)
 
 	return bc->nasid;
 }
+EXPORT_SYMBOL(pcibus_to_node);
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
 	pci_fixup_ioc3);