bpf: move new add member to the end of the struct bpf_prog_aux

hulk inclusion
category: bugfix
bugzilla: NA
CVE: NA

-------------------------------------------------

Move new member to the end of the struct bpf_prog_aux to
avoid potential kabi problem.

Fixes: 6a9e078136ef ("bpf: fix kabi for struct bpf_prog_aux and struct bpf_raw_event_map")
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>