scsi: Remove SCSI CDROM MAINTAINERS entry

There's little point in keeping this one separately maintained these days,
so just remove the entry and it'll fall under the SCSI subsystem where it
belongs.

Link: https://lore.kernel.org/r/c5e12bd1-10de-634c-d6b3-dac79ed01af5@kernel.dk


Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>