Create platform_device.h to contain all the platform device details.

Convert everyone who uses platform_bus_type to include
linux/platform_device.h.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/dummy_hcd.c

@@ -50,7 +50,7 @@
 #include <linux/list.h>
 #include <linux/interrupt.h>
 #include <linux/version.h>
-
+#include <linux/platform_device.h>
 #include <linux/usb.h>
 #include <linux/usb_gadget.h>