bpf: flatten bpf_probe_register call chain

bpf: flatten bpf_probe_register call chain

bpf_probe_register() and __bpf_probe_register() have identical
signatures and bpf_probe_register() just redirect to
__bpf_probe_register(). So get rid of this extra function call step to
simplify following the source code.

It has no difference at runtime due to inlining, of course.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Message-ID: <20240319233852.1977493-2-andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>