perf bpf: Switch to new btf__raw_data API

Replace the call to btf__get_raw_data with new API btf__raw_data.
The old APIs will be deprecated in libbpf v0.7+. No functionality
change.
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211022130623.1548429-3-hengqi.chen@gmail.com

tools/perf/util/bpf-event.c

@@ -110,7 +110,7 @@ static int perf_env__fetch_btf(struct perf_env *env,
 	u32 data_size;
 	const void *data;
 
-	data = btf__get_raw_data(btf, &data_size);
+	data = btf__raw_data(btf, &data_size);
 
 	node = malloc(data_size + sizeof(struct btf_node));
 	if (!node)