dontaudit untrusted_app exec_type:file getattr

Programs routinely scan through /system, looking at the files there.
Don't generate an SELinux denial when it happens.

Bug: 21120228
Change-Id: I85367406e7ffbb3e24ddab6f97448704df990603

untrusted_app.te

@@ -111,6 +111,11 @@ userdebug_or_eng(`
   allow untrusted_app perfprofd_data_file:file r_file_perms;
   allow untrusted_app perfprofd_data_file:dir r_dir_perms;
 ')
+
+# Programs routinely attempt to scan through /system, looking
+# for files. Suppress the denials when they occur.
+dontaudit untrusted_app exec_type:file getattr;
+
 ###
 ### neverallow rules
 ###