bpf: pass program type in struct bpf_cfg_in

bpf: pass program type in struct bpf_cfg_in

Program type is needed both for parsing and loading of
the program.  Parsing may also induce the type based on
signatures from __bpf_prog_meta.  Instead of passing
the type around keep it in struct bpf_cfg_in.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>