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/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 317a979..2b799d4 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -12,7 +12,7 @@
 #define _LINUX_SERIAL_8250_H
 
 #include <linux/serial_core.h>
-#include <linux/device.h>
+#include <linux/platform_device.h>
 
 /*
  * This is the platform device platform_data structure