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>
diff --git a/drivers/serial/mpsc.c b/drivers/serial/mpsc.c
index efe79b1..f4c709b 100644
--- a/drivers/serial/mpsc.c
+++ b/drivers/serial/mpsc.c
@@ -52,6 +52,8 @@
  * 4) AFAICT, hardware flow control isn't supported by the controller --MAG.
  */
 
+#include <linux/platform_device.h>
+
 #include "mpsc.h"
 
 /*