media: i2c: ds90ub960: Drop check on number of active routes

media: i2c: ds90ub960: Drop check on number of active routes

The subdev core now limits the number of active routes to
V4L2_FRAME_DESC_ENTRY_MAX. Drop the duplicated check in the ds90ub960
driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>