traced_probes: allow perfetto to read /proc/pressure entries

Allow perfetto to read /proc/pressure/* entries for cpu/io/memory.

Test: Capture perfetto psi traces manually
Bug: 315152880
Change-Id: I08c3d3eca39ee65eb3f93d609a8ef7cf9c25f6a0
diff --git a/private/traced_probes.te b/private/traced_probes.te
index 0d68fa3..003e992 100644
--- a/private/traced_probes.te
+++ b/private/traced_probes.te
@@ -84,6 +84,9 @@
   proc_vmstat
   proc_stat
   proc_buddyinfo
+  proc_pressure_cpu
+  proc_pressure_io
+  proc_pressure_mem
 }:file r_file_perms;
 
 # Allow access to read /sys/class/devfreq/ and /$DEVICE/cur_freq files