Revert "scsi: iscsi: fix kabi broken in struct iscsi_transport"

hulk inclusion
category: bugfix
bugzilla: 188176, https://gitee.com/openeuler/kernel/issues/I67294


CVE: NA

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This reverts commit 230035ef.

Drivers use tgt_dscvr will compile failed because API has changed.

Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>