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/8250.c b/drivers/serial/8250.c
index afb7ddf..f47d2c4 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -33,7 +33,7 @@
 #include <linux/sysrq.h>
 #include <linux/mca.h>
 #include <linux/delay.h>
-#include <linux/device.h>
+#include <linux/platform_device.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/serial_reg.h>