Input: serio - do not include linux/freezer.h

Commit ea486e681188d64c6a101d8d06414aef0f9f0cd3 changed kseriod thread
to become not freezable so we do not need this include anymore.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/serio/serio.c

@@ -37,7 +37,6 @@
 #include <linux/slab.h>
 #include <linux/kthread.h>
 #include <linux/mutex.h>
-#include <linux/freezer.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("Serio abstraction core");