scsi: pm80xx: Increase reserved tags from 8 to 128

scsi: pm80xx: Increase reserved tags from 8 to 128

Increase the number of reserved tags to prevent command processing failures
when the driver is under stress. 8 reserved tags are quickly getting all
used up leading to errors when command completions are delayed.

The driver needs ~512 ccbs/tags for maximum I/O utilization:

  16 (max disks) * 32 (max SATA queue depth) = ~512 ccbs/tags.

By reserving 128 tags the driver will still have plenty of tags/ccbs left:

  1024 (max ccbs) - 128 (reserved slot) = 896 tags/ccbs left.

Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Signed-off-by: Salomon Dushimirimana <salomondush@google.com>
Link: https://lore.kernel.org/r/20241126224923.973528-1-salomondush@google.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>