[PATCH] Squash warning in ohci-pci.c on PowerBooks

Apple PowerBooks want <asm/prom.h> in ohci-pci.c for the prototype of
pci_device_to_OF_node().  This patch adds it to the already present
list of PowerBook specific #includes:

drivers/usb/host/ohci-pci.c

@@ -18,6 +18,7 @@
 #include <asm/machdep.h>
 #include <asm/pmac_feature.h>
 #include <asm/pci-bridge.h>
+#include <asm/prom.h>
 #ifndef CONFIG_PM
 #	define CONFIG_PM
 #endif