Allow clatd to read from packet sockets and write to raw sockets

This addresses the following denials that occur when switching
clatd from an IPv6 tun interface to packet and raw sockets:

avc: denied { net_raw } for pid=3540 comm="clatd" capability=13 scontext=u:r:clatd:s0 tcontext=u:r:clatd:s0 tclass=capability
avc: denied { create } for pid=3540 comm="clatd" scontext=u:r:clatd:s0 tcontext=u:r:clatd:s0 tclass=packet_socket
avc: denied { bind } for pid=3540 comm="clatd" scontext=u:r:clatd:s0 tcontext=u:r:clatd:s0 tclass=packet_socket
avc: denied { setopt } for pid=3540 comm="clatd" scontext=u:r:clatd:s0 tcontext=u:r:clatd:s0 tclass=packet_socket
avc: denied { read } for pid=3540 comm="clatd" path="socket:[19117]" dev="sockfs" ino=19117 scontext=u:r:clatd:s0 tcontext=u:r:clatd:s0 tclass=packet_socket

Bug: 15340961
Change-Id: I3c06e8e3e0cfc0869a7b73c803bbffe28369ee5e