Update system rule for qtaguid file.

system.te

@@ -74,8 +74,7 @@ allow system appdomain:dir r_dir_perms;
 allow system appdomain:{ file lnk_file } rw_file_perms;
 
 # Write to /proc/net/xt_qtaguid/ctrl.
-# XXX Split /proc/net into its own type.
-allow system proc:file write;
+allow system qtaguid:file write;
 
 # Notify init of death.
 allow system init:process sigchld;