bpf: Allow calling bpf_prog_test kfuncs in tracing programs

In addition to TC hook, enable these in tracing programs so that they
can be used in selftests.
Acked-by: NYonghong Song <yhs@fb.com>
Signed-off-by: NKumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20220809213033.24147-2-memxor@gmail.comSigned-off-by: NAlexei Starovoitov <ast@kernel.org>

net/bpf/test_run.c

@@ -1628,6 +1628,7 @@ static int __init bpf_prog_test_run_init(void)
 	int ret;
 
 	ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
+	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
 	return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
 						  ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
 						  THIS_MODULE);