PCI: always export pci_scan_single_device

This patch fixes the following build error with CONFIG_HOTPLUG=n:

  MODPOST 2137 modules
ERROR: "pci_scan_single_device" [drivers/edac/i82875p_edac.ko] undefined!
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/probe.c

@@ -971,6 +971,7 @@ struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
 
 	return dev;
 }
+EXPORT_SYMBOL(pci_scan_single_device);
 
 /**
  * pci_scan_slot - scan a PCI slot on a bus for devices.
@@ -1158,7 +1159,6 @@ EXPORT_SYMBOL(pci_add_new_bus);
 EXPORT_SYMBOL(pci_do_scan_bus);
 EXPORT_SYMBOL(pci_scan_slot);
 EXPORT_SYMBOL(pci_scan_bridge);
-EXPORT_SYMBOL(pci_scan_single_device);
 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
 #endif