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>

sound/arm/pxa2xx-ac97.c

@@ -13,7 +13,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
-#include <linux/device.h>
+#include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/wait.h>
 #include <linux/delay.h>