PCI: include linux/pm_wakeup.h for device_set_wakeup_capable

drivers/pci/pci.c needs pm_wakeup.h since it uses device_set_wakup_capable().
The latter also needs to be stubbed out for !CONFIG_PM.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h
index 3af0c8d..0aae777 100644
--- a/include/linux/pm_wakeup.h
+++ b/include/linux/pm_wakeup.h
@@ -63,6 +63,8 @@
 	dev->power.can_wakeup = !!val;
 }
 
+static inline void device_set_wakeup_capable(struct device *dev, int val) { }
+
 static inline int device_can_wakeup(struct device *dev)
 {
 	return dev->power.can_wakeup;