perf lock contention: Fix a build error on 32-bit

Fix a build error on 32-bit system:

  util/bpf_lock_contention.c: In function 'lock_contention_get_name':
  util/bpf_lock_contention.c:253:50: error: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'u64 {aka long long unsigned int}' [-Werror=format=]
     snprintf(name_buf, sizeof(name_buf), "cgroup:%lu", cgrp_id);
                                                  ~~^
                                                  %llu
  cc1: all warnings being treated as errors

Fixes: d0c502e ("perf lock contention: Prepare to handle cgroups")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: avagin@google.com
Cc: daniel.diaz@linaro.org
Link: https://lore.kernel.org/r/20231118024858.1567039-3-yangjihong1@huawei.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Author: Yang Jihong

tools/perf/util/bpf_lock_contention.c

@@ -12,6 +12,7 @@
 #include <linux/zalloc.h>
 #include <linux/string.h>
 #include <bpf/bpf.h>
+#include <inttypes.h>
 
 #include "bpf_skel/lock_contention.skel.h"
 #include "bpf_skel/lock_data.h"
@@ -250,7 +251,7 @@ static const char *lock_contention_get_name(struct lock_contention *con,
 		if (cgrp)
 			return cgrp->name;
 
-		snprintf(name_buf, sizeof(name_buf), "cgroup:%lu", cgrp_id);
+		snprintf(name_buf, sizeof(name_buf), "cgroup:%" PRIu64 "", cgrp_id);
 		return name_buf;
 	}