Auditallow untrusted_app procfs access.

Access to proc is being removed but there are still some consumers.  Add
an auditallow to identify them and adjust labels appropriately before
removal.

Change-Id: I853b79bf0f22a71ea5c6c48641422c2daf247df5

untrusted_app.te

@@ -96,6 +96,8 @@ dontaudit untrusted_app exec_type:file getattr;
 # TODO: access of /proc/meminfo, give specific label or switch to
 # using meminfo service
 allow untrusted_app proc:file r_file_perms;
+# https://code.google.com/p/chromium/issues/detail?id=586021
+auditallow untrusted_app proc:file r_file_perms;
 # access /proc/net/xt_qtguid/stats
 r_dir_file(untrusted_app, proc_net)