Correct usage of tag-command-queueing methods:

  o Properly call scsi_activate_tcq() rather than
    scsi_adjust_queue_depth().
  o Properly retrieve tag message from command via
    scsi_populate_tag_msg().
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>