pm80xx: add support for PMC Sierra 8070 and PMC Sierra 8072 SAS controllers

These SAS controllers support speeds up to 12Gb.

Signed-off-by: Benjamin Rood <brood@attotech.com>
Reviewed-by: Jack Wang <jinpu.wang@profitbricks.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>