Allow RILD to read xt_qtaguid iface stats on M/S

The RILD process on marlin/sailfish need to get the per iface stats
from proc/net/xt_qtaguid/iface_stat_fmt file. So we have to grant it
the permission since there is no native API for that.

Bug: 68774956
Test: device boot without selinux violation
Change-Id: I34081a10500bcffd53c9a51ce9dc932abc069c6f
diff --git a/sepolicy/rild.te b/sepolicy/rild.te
index db7d973..7cbe38e 100644
--- a/sepolicy/rild.te
+++ b/sepolicy/rild.te
@@ -47,3 +47,6 @@
 # TODO(b/36613472): Remove this once system_server,  mediaserver, bluetooth, and radio no longer
 # communicate with rild over sockets.
 typeattribute rild socket_between_core_and_vendor_violators;
+
+# Allow vendor native process to read the proc file of xy_qtaguid
+allow rild proc_qtaguid_stat:file r_file_perms;