[media] staging: atomisp: Set step to 0 for mt9m114 menu control

menu controls are not allowed to have a step size, set step to 0 to
fix an oops from the WARN_ON in v4l2_ctrl_new_custom() triggering
because of this.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/i2c/mt9m114.c

@@ -1499,7 +1499,7 @@ static struct v4l2_ctrl_config mt9m114_controls[] = {
 	 .type = V4L2_CTRL_TYPE_MENU,
 	 .min = 0,
 	 .max = 3,
-	 .step = 1,
+	 .step = 0,
 	 .def = 1,
 	 .flags = 0,
 	 },