Provide LDM-based driver registration/removal interface for drivers
to use.  We make the old device discovery code ignore devices
claimed via the LDM framework.  However, the LDM framework ignores
devices that may be in use by the old device discovery code.  This
is fine since the only devices that will still use the old discovery
code will be SCSI drivers.

Currently, we don't provide a useful dev.name entry.