scsi: scsi_debug: Remove a reference to in_use_bm

scsi: scsi_debug: Remove a reference to in_use_bm

Commit f1437cd1e535 ("scsi: scsi_debug: Drop sdebug_queue") removed the
'in_use_bm' struct member. Hence remove a reference to that struct member
from the procfs host info file.

Fixes: f1437cd1e535 ("scsi: scsi_debug: Drop sdebug_queue")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20250224115517.495899-3-john.g.garry@oracle.com
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>