misc: mic: Fix randconfig build error

Fixes randconfig build error reported at
http://www.spinics.net/lists/kernel/msg2092346.html

Reported-by: Jim Davis <jim.epost@gmail.com>
Reviewed-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mic/cosm/cosm_debugfs.c

@@ -21,6 +21,7 @@
 
 #include <linux/debugfs.h>
 #include <linux/slab.h>
+#include <linux/io.h>
 #include "cosm_main.h"
 
 /* Debugfs parent dir */