bpf: Backport __BPF_FUNC_MAPPER and annotation from mainline

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NI6R


CVE: NA

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BPF program call helper functions according to bpf_func_id.
Misorder id of helper function will destroy the consistency
of BPF program, making it unusable in other versions. Let's
backport __BPF_FUNC_MAPPER and the corresponding annotation
from mainline.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Kuohai Xu <xukuohai@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>