I believe it should be:
MAKEDEV scd
ln -s scd0 cdrom
I am sure someone will correct me if I am wrong. . .
GL
NOTE: Sometimes, some apps will only use the generic scsi driver to work with your cdrom, if that is the case, you will also have to create the generic scsi devices for the app to work. One such popular app. is cdrecord. If that is the case, you have to enable generice scsi support in your kernel and run MAKEDEV sg as well as having created the scd devices. I just thought I would let you know just in case. . .
/edit: added NOTE and changed sad face. . .😉