libbpf: fix up few libbpf.map problems

Seems like we missed to add 2 APIs to libbpf.map and another API was
misspelled. Fix it in libbpf.map.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220627211527.2245459-16-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>