USB: usb-storage: Associate the name of the interface with the scsi host

Instead of reporting "SCSI emulation for USB Mass Storage devices",
report "usb-storage 1-4:1.0".

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>