This involves many changes/fixes in the floppy driver:
- Stop creating ourselves our DOS device, it's up to the MountMgr or to the kernel;
- Report each new floppy drive to the MountMgr (this is a hack for now);
- As a consequence, stop storing the symlink name into the DRIVE_INFO structure;
- Store the device name instead;
- On IOCTL_MOUNTDEV_QUERY_DEVICE_NAME, don't return DOS device, but device name;
- On IOCTL_MOUNTDEV_QUERY_DEVICE_NAME, properly return if buffer is way too small;
- Hackplement IOCTL_MOUNTDEV_QUERY_UNIQUE_ID so that it returns device name.
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