[NC#2] clatd: allow clatd access raw and packet socket inherited from netd

Needed because the raw and packet socket setup are moved from
clatd to netd. Netd pass the configured raw and packet sockets
to clatd. clatd needs the permission to access inherited
objects.

Test: manual test
1. Connect to ipv6-only wifi.
2. Try IPv4 traffic.
   $ ping 8.8.8.8

Test:
Change-Id: If6479f815a37f56715d7650c714202fcc1ec466b
diff --git a/private/clatd.te b/private/clatd.te
index dfcaf57..104121e 100644
--- a/private/clatd.te
+++ b/private/clatd.te
@@ -12,6 +12,8 @@
 # Access objects inherited from netd.
 allow clatd netd:fd use;
 allow clatd netd:fifo_file { read write };
+allow clatd netd:packet_socket { read write };
+allow clatd netd:rawip_socket { read write };
 
 allow clatd self:global_capability_class_set { net_admin net_raw setuid setgid };