Revert "Remove app access to qtaguid ctrl/stats file"

This reverts commit fad0b04d.

Reason for revert: This change crashed facebook App on dogfood build.

Bug: 72977484
Change-Id: I4f35b00c11afbd4914f572d3cc0378d740403ed2

public/app.te

@@ -169,7 +169,15 @@ userdebug_or_eng(`
   allow appdomain heapdump_data_file:file append;
 ')
 
+# Write to /proc/net/xt_qtaguid/ctrl file.
+allow appdomain qtaguid_proc:file rw_file_perms;
 r_dir_file({ appdomain -ephemeral_app -isolated_app }, proc_net)
+# read /proc/net/xt_qtguid/*stat* to per-app network data usage.
+# Exclude isolated app which may not use network sockets.
+r_dir_file({ appdomain -isolated_app }, proc_qtaguid_stat)
+# Everybody can read the xt_qtaguid resource tracking misc dev.
+# So allow all apps to read from /dev/xt_qtaguid.
+allow { appdomain -isolated_app } qtaguid_device:chr_file r_file_perms;
 
 # Grant GPU access to all processes started by Zygote.
 # They need that to render the standard UI.
@@ -542,8 +550,3 @@ neverallow appdomain proc_uid_concurrent_policy_time:file *;
 
 # Apps cannot access proc_uid_cpupower
 neverallow appdomain proc_uid_cpupower:file *;
-
-# Apps cannot access proc/net/xt_qtaguid/ files anymore since P.
-neverallow { appdomain -shell } qtaguid_proc:file rw_file_perms;
-neverallow { appdomain -shell } proc_qtaguid_stat:{ file lnk_file } r_file_perms;
-neverallow { appdomain -shell } qtaguid_device:chr_file r_file_perms;