staging: unisys: visorhid: remove unnecessary include of serio.h

No need for serio.h to be included.
Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorhid/visorhid.c

@@ -24,7 +24,6 @@
 #include <linux/fb.h>
 #include <linux/fs.h>
 #include <linux/input.h>
-#include <linux/serio.h>
 #include <linux/uaccess.h>
 
 #include "keyboardchannel.h"