scsi: hisi_sas: Add poll support for v3 hw

Add a module parameter to set how many queues are used for iopoll. Also
fill the interface mq_poll. For internal I/Os from libsas and libata we use
non-iopoll queue (queue 0) to deliver and complete them. But for internal
abort I/Os, just don't send them for poll queues.

There is still a risk associated as this sends internal abort commands to
non-iopoll queues which actually requires sending an internal abort command
to every queue. As a result, make the module parameter as "experimental"
for now.

Signed-off-by: Xiang Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

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