bpf: Add new bpf helper to get SO_ORIGINAL_DST/REPLY_SRC

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


CVE: NA

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Add new optname(BPF_SO_ORIGINAL_DST 800, BPF_SO_REPLY_SRC 801)
to get origdst/reply src for bpf progs.
Now only support IPv4.

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