scsi: qla2xxx: Remove unused qla_sess_op_cmd_list from scsi_qla_host_t

The qla_sess_op_cmd_list was introduced in commit 8b2f5ff3 ("qla2xxx:
cleanup cmd in qla workqueue before processing TMR"). Then the usage of
this list was dropped in commit fb35265b

 ("scsi: qla2xxx: Remove
session creation redundant code").

Thus, remove this list since it is no longer used.

Link: https://lore.kernel.org/r/AS8PR10MB49524AAB4C8016E4AFF17FFB9D2D9@AS8PR10MB4952.EURPRD10.PROD.OUTLOOK.COM
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Gleb Chesnokov <Chesnokov.G@raidix.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>