scsi: smartpqi: add support for PQI Config Table handshake

Add support for new IUs and parsing of the Firmware Features section of the
PQI Config Table to implement the "handshake" between the driver and
firmware to communicate firmware features supported and enabled by the
driver.

Reviewed-by: Ajish Koshy <ajish.koshy@microsemi.com>
Reviewed-by: Mahesh Rajashekhara <mahesh.rajashekhara@microsemi.com>
Reviewed-by: Murthy Bhat <murthy.bhat@microsemi.com>
Reviewed-by: Justin Lindley <justin.lindley@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>