Adding bogus SCSI commands 0x51 (SCSICDROM_READ_DISCINFO) and
0x52 (SCSICDROM_READ_TRACKINFO) to the SCSI emulation layer, to allow NetBSD/pmax 4.0_BETA to be installed from CDROM.
Authored by: debug 2006-08-25
Parent: [r4371]
Child: [r4373]