common: Move pcie_setup_hoses() to PPC header

Only one board needs this definition. Move it to an arch-specific header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/include/asm/4xx_pci.h b/arch/powerpc/include/asm/4xx_pci.h
index a68c875..276a780 100644
--- a/arch/powerpc/include/asm/4xx_pci.h
+++ b/arch/powerpc/include/asm/4xx_pci.h
@@ -57,5 +57,6 @@
 void __pci_target_init(struct pci_controller *hose);
 void __pci_master_init(struct pci_controller *hose);
 void pci_target_init(struct pci_controller *);
+void pcie_setup_hoses(int busno);
 
 #endif