Add tests to use the new enum kflag and enum64 API functions
in selftest btf_write.
Acked-by: NAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: NYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220607062703.3724287-1-yhs@fb.comSigned-off-by: NAlexei Starovoitov <ast@kernel.org>