This enum was created to help put distinction between the commandset and
the interface type, as ATAPI devices are simply ATA devices utilizing
the SCSI commandset. Because we don't support ATAPI, putting such type
of distinction is pointless, so let's remove this for now.
This change in fact does the following:
1. Use support for symlinks between /sys/dev/block/ storage device
identifier nodes and devices in /sys/devices/storage/{LUN}.
2. Add basic nodes in a /sys/devices/storage/{LUN} directory, to let
userspace to know about the device and its details.