Revert "sepolicy: remove all remaining qtaguid stuff."

This reverts commit af08bd3aa81e801bb4dafa65a579183e2be685f4.

Reason for revert: Broke <device>-next-userdebug builds

Bug: 357439147
Change-Id: I094353bde91e71c5d92777f6d152ad193f039277
diff --git a/private/system_server.te b/private/system_server.te
index aff3cb6..1c9f732 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -1179,6 +1179,7 @@
 
 r_dir_file(system_server, proc_asound)
 r_dir_file(system_server, proc_net_type)
+r_dir_file(system_server, proc_qtaguid_stat)
 allow system_server {
   proc_cmdline
   proc_loadavg