scsi: iscsi: fix kabi broken in struct iscsi_cls_conn

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5HL0X


CVE: NA

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In struct iscsi_cls_conn, "lock", "flags", "cleanup_work" are
added and the kabi is broken, fix it by wrapper.

Signed-off-by: Zhang Wensheng <zhangwensheng5@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>