selinux changes for DNS metrics.

1. Allow the system server to create the dns_listener service.
2. Allow netd to use said service.

Change-Id: Ic6394d7b2bdebf1c4d6cf70a79754a4996e943e2
diff --git a/netd.te b/netd.te
index 51445fc..6864ad6 100644
--- a/netd.te
+++ b/netd.te
@@ -65,6 +65,9 @@
 allow netd system_server:binder call;
 allow netd permission_service:service_manager find;
 
+# Allow netd to talk to the framework service which collects DNS query metrics.
+allow netd dns_listener_service:service_manager find;
+
 # Allow netd to operate on sockets that are passed to it.
 allow netd netdomain:{tcp_socket udp_socket rawip_socket dccp_socket tun_socket} {read write getattr setattr getopt setopt};
 allow netd netdomain:fd use;