Add sepolicy to allow OT daemon to write to statsd

Bug: 230565248

Test: push data to statsd_testdrive and it works now

Change-Id: I48c3affdd1fbd62df5b8eaff9908c5f3bbeda4d8
diff --git a/private/ot_daemon.te b/private/ot_daemon.te
index 1021fd9..066d3d5 100644
--- a/private/ot_daemon.te
+++ b/private/ot_daemon.te
@@ -29,3 +29,6 @@
 binder_use(ot_daemon)
 add_service(ot_daemon, ot_daemon_service)
 binder_call(ot_daemon, system_server)
+
+# Allow OT daemon to write to statsd
+unix_socket_send(ot_daemon, statsdw, statsd)