scsi: ata: enhance the definition of SET MAX feature field value

There are two other values for SET MAX feature field according to ata
protocol. So definite them.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>