media: v4l2-mc: Drop subdev check in v4l2_create_fwnode_links_to_pad()

While updating v4l2_create_fwnode_links_to_pad() to accept non-subdev
sinks, the check is_media_entity_v4l2_subdev() was not removed which
prevented the function from being used with non-subdev sinks, Drop the
unnecessary check.

Fixes: bd5a03bc

 ("media: Accept non-subdev sinks in v4l2_create_fwnode_links_to_pad()")
Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>