tcp: Add some stub info for KABI consistency

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4PY1Q


CVE: NA

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We add stub info in some structures to maintain the consistency of KABI

Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>