bpf, net: introduce bpf_struct_ops_desc.

Move some of members of bpf_struct_ops to bpf_struct_ops_desc.  type_id is
unavailabe in bpf_struct_ops anymore. Modules should get it from the btf
received by kmod's init function.

Cc: netdev@vger.kernel.org
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240119225005.668602-4-thinker.li@gmail.com


Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>