scsi: hisi_sas: Use non-atomic bitmap functions when possible

All uses of the 'hisi_hba->slot_index_tags' bitmap are protected with the
'hisi_hba->lock' spinlock.

Prefer the non-atomic '__[set|clear]_bit()' functions to save a few cycles.

Link: https://lore.kernel.org/r/8ee33e463523db080e6a2c06f332e47abb69359b.1637961191.git.christophe.jaillet@wanadoo.fr


Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>