libbpf: move post-creation steps for ARENA map

Consolidate other special post map creation steps outside of
bpf_object__create_map(). We have bpf_object__populate_internal_map()
and PROG_ARRAY initialization logic there, so it seems fitting to put
ARENA's mmap step there as well for consistency.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
1 file changed