libbpf: add lsm_cgoup_sock type

lsm_cgroup/ is the prefix for BPF_LSM_CGROUP.

Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220628174314.1216643-9-sdf@google.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>