traced_probes: allow traced_probes to access diskstats info

Test: check selinux log while perfetto I/O profiling
Change-Id: I45247b72343c8bca219c7250c467c97e5dacab5c
Signed-off-by: Daeho Jeong <daehojeong@google.com>
diff --git a/private/traced_probes.te b/private/traced_probes.te
index 5cc271c..86f5067 100644
--- a/private/traced_probes.te
+++ b/private/traced_probes.te
@@ -90,6 +90,9 @@
 allow traced_probes sysfs_devfreq_dir:dir r_dir_perms;
 allow traced_probes sysfs_devfreq_cur:file r_file_perms;
 
+# Allow access to read /proc/diskstats for I/O profiling.
+allow traced_probes proc_diskstats:file r_file_perms;
+
 # Allow access to the IHealth and IPowerStats HAL service for tracing battery counters.
 hal_client_domain(traced_probes, hal_health)
 hal_client_domain(traced_probes, hal_power_stats)