scsi: mpi3mr: Handle unaligned PLL in unmap cmnds

scsi: mpi3mr: Handle unaligned PLL in unmap cmnds

The following special handling is needed for UNMAP commands issued to NVMe
drives:

 - On B0 boards, if the parameter list length is greater than 24 and not a
   16-byte multiple, then truncate the parameter list length to a 16-byte
   multiple.

 - On A0 boards, if the parameter list length is greater than block
   descriptor data length + 8, then truncate the parameter list length to
   block descriptor data length + 8 value.

Link: https://lore.kernel.org/r/20211220141159.16117-10-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>