media: imx-mipi-csis: Remove an incorrect fwnode_handle_put() call

The commit in Fixes has removed an fwnode_graph_get_endpoint_by_id() call
in mipi_csis_subdev_init().
So the reference that was taken should not be released anymore in the
error handling path of the probe and in the remove function.

Remove the now incorrect fwnode_handle_put() calls.

Fixes: 1029939b ("media: v4l: async: Simplify async sub-device fwnode matching")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>