scsi: core: Use SCSI_SCAN_INITIAL in do_scsi_scan_host()

scsi: core: Use SCSI_SCAN_INITIAL in do_scsi_scan_host()

Instead of using hardcoded '0' as the do_scsi_scan_host() ->
scsi_scan_host_selected() rescan arg, use proper macro SCSI_SCAN_INITIAL.

Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20221121121725.1910795-3-john.g.garry@oracle.com
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>