pci: move pciauto_config_init() to pci.h

Fixing build regressions for the Integrator I get find that a few
boards try to work around the missing declaration of
pciauto_config_init() by declaring it in the local scope. This
does not make sense when the sibling functions are in <pci.h>
so move the function to the header, ridding the build error
in the Integrator and getting rid of the local declarations
here and there.

Reported-by:  Wolfgang Denk <wd@denx.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/include/pci.h b/include/pci.h
index 1284c42..7d98ad4 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -527,6 +527,7 @@
 				 struct pci_region *mem,
 				 struct pci_region *prefetch,
 				 struct pci_region *io);
+extern void pciauto_config_init(struct pci_controller *hose);
 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 
 extern pci_dev_t pci_find_device (unsigned int vendor, unsigned int device, int index);