[POWERPC] rename add_bridge to avoid namespace clashes

Many platforms currently define their own add_bridge function, some
of them globally. This breaks some multiplatform configurations.
Prefixing each of these functions with the platform name avoids
this problem.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/powerpc/platforms/86xx/pci.c b/arch/powerpc/platforms/86xx/pci.c
index 8235c56..c1d65fa 100644
--- a/arch/powerpc/platforms/86xx/pci.c
+++ b/arch/powerpc/platforms/86xx/pci.c
@@ -148,7 +148,7 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-int __init add_bridge(struct device_node *dev)
+int __init mpc86xx_add_bridge(struct device_node *dev)
 {
 	int len;
 	struct pci_controller *hose;