DO NOT MERGE: untrusted_app: drop /proc auditallow

It's unlikely we'll get /proc locked down for the N release, so
delete the auditallow to avoid spamming the logs. Mark this
commit as DO NOT MERGE so we can continue to make progress on this
for future Android releases.

Change-Id: Ibf27bc5cb1b23c21e123aae8a4f190560d0ac2dc

untrusted_app.te

@@ -99,7 +99,6 @@ allow untrusted_app proc_meminfo:file r_file_perms;
 
 # https://code.google.com/p/chromium/issues/detail?id=586021
 allow untrusted_app proc:file r_file_perms;
-auditallow untrusted_app proc:file r_file_perms;
 # access /proc/net/xt_qtguid/stats
 r_dir_file(untrusted_app, proc_net)