Ignore access to /proc/zoneinfo for apps

Similarly to /proc/vmstat, apps are not allowed to access this file.
Ignore the audit message, as this is the most reported denial in our
droidfood population.

Test: m selinux_policy
Change-Id: I88ed1aa1bfad33b462d971e739ca65791cb0227b
diff --git a/private/untrusted_app_all.te b/private/untrusted_app_all.te
index 26077f3..f3cc07f 100644
--- a/private/untrusted_app_all.te
+++ b/private/untrusted_app_all.te
@@ -153,9 +153,12 @@
 
 # These have been disallowed since Android O.
 # For P, we assume that apps are safely handling the denial.
-dontaudit untrusted_app_all proc_stat:file read;
-dontaudit untrusted_app_all proc_vmstat:file read;
-dontaudit untrusted_app_all proc_uptime:file read;
+dontaudit untrusted_app_all {
+  proc_stat
+  proc_uptime
+  proc_vmstat
+  proc_zoneinfo
+}:file read;
 
 # Allow the allocation and use of ptys
 # Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm