watchdog: mpc8xxx: Remove unneeded linux/miscdevice.h include

watchdog/mpc8xxx_wdt.c does not use any miscdevice so this patch remove
this unnecessary inclusion.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/watchdog/mpc8xxx_wdt.c

@@ -23,7 +23,6 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/timer.h>
-#include <linux/miscdevice.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/module.h>