PCI: Move cpci_hotplug_init() proto to header file

cpci_hotplug_init() and cpci_hotplug_exit() are defined in
cpci_hotplug_core.c but had extern declarations in pci_hotplug_core.c.
This puts the declarations in a header file included both places so
the compiler can help keep everything consistent.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/hotplug/cpci_hotplug.h

@@ -99,4 +99,12 @@ extern int cpci_led_off(struct slot * slot);
 extern int cpci_configure_slot(struct slot *slot);
 extern int cpci_unconfigure_slot(struct slot *slot);
 
+#ifdef CONFIG_HOTPLUG_PCI_CPCI
+int cpci_hotplug_init(int debug);
+void cpci_hotplug_exit(void);
+#else
+static inline int cpci_hotplug_init(int debug) { return 0; }
+static inline void cpci_hotplug_exit(void) { }
+#endif
+
 #endif	/* _CPCI_HOTPLUG_H */