cdrom: Remove now superfluous sentinel element from ctl_table array

cdrom: Remove now superfluous sentinel element from ctl_table array

This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)

Remove sentinel element from cdrom_table

Signed-off-by: Joel Granados <j.granados@samsung.com>
Link: https://lore.kernel.org/lkml/20231002-jag-sysctl_remove_empty_elem_drivers-v2-1-02dd0d46f71e@samsung.com
Reviewed-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/lkml/20231002214528.15529-1-phil@philpotter.co.uk
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20231002220203.15637-2-phil@philpotter.co.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>