bpf: Add bpf_get_sockops_uid_gid helper function

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8KU3B


CVE: NA

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Add the function for bpf sock_ops hook to get sock's uid and gid.

Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>