Revert "Rollback DAC_READ_SEARCH capability"

This reverts commit f9250dc8aa420019965d8222532bd834ad3fec65.

Reason for revert: 
The matching SELinux change (aosp/631805) landed

Change-Id: If4e084669ff281627bbe523e562695f9fc9474f4
diff --git a/perfetto.rc b/perfetto.rc
index b8b5473..23abaf2 100644
--- a/perfetto.rc
+++ b/perfetto.rc
@@ -31,8 +31,7 @@
     # unexpectedly.
     onrestart exec_background - nobody shell -- /system/bin/traced_probes --cleanup-after-crash
     file /dev/kmsg w
-    # TODO(primiano): enable this once matching selinux rules are in.
-    # capabilities DAC_READ_SEARCH
+    capabilities DAC_READ_SEARCH
 
 on property:sys.traced.enable_override=1
     setprop persist.traced.enable 1