hisi_sas: add slot_index_alloc_quirk_v2_hw()

Add v2 hw custom function slot_index_alloc_quirk_v2_hw().  SAS devices
should have IPTT bit0 equal to 1.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>