scsi: xen-scsifront: Compability status handling

The Xen guest might run against arbitrary backends, so the driver might
receive a status with driver_byte set. Map these errors to DID_ERROR to be
consistent with recent changes.

Link: https://lore.kernel.org/r/20210427083046.31620-14-hare@suse.de


Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>