Add driver support for up to 256 LUNs per device.

Update AIO path to pass the appropriate LUN number for base-code to target
the correct LUN.

Update RAID IO path to pass the appropriate LUN number for FW to target the
correct LUN.

Pass the correct LUN number while doing a LUN reset.

Count the outstanding commands based on LUN number.  While removing a
Multi-LUN device, wait for all outstanding commands to complete for all
LUNs.

Add Feature bit support.

Link: https://lore.kernel.org/r/165730603067.177165.14016422176841798336.stgit@brunhildaReviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Kumar Meiyappan <Kumar.Meiyappan@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>