selftests/bpf: Remove unused struct 'scale_test_def'

'scale_test_def' is unused since commit 3762a39c ("selftests/bpf: Split out
bpf_verif_scale selftests into multiple tests"). Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240602234112.225107-2-linux@treblig.org

tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c

@@ -45,12 +45,6 @@ static int check_load(const char *file, enum bpf_prog_type type)
 	return err;
 }
 
-struct scale_test_def {
-	const char *file;
-	enum bpf_prog_type attach_type;
-	bool fails;
-};
-
 static void scale_test(const char *file,
 		       enum bpf_prog_type attach_type,
 		       bool should_fail)