sepolicy: fix clatd denial

when attempting to use clatd for 4-6-4 xlat, denials like the
followng are seen during initialization:

avc: denied { map } for pid=3005 comm="clatd" path="socket:[58648]"
dev="sockfs" ino=58648 scontext=u:r:clatd:s0 tcontext=u:r:clatd:s0
tclass=packet_socket permissive=0

This patch allows clatd to properly map the packet socket after
being brought up by netd.

Change-Id: Ifdb4b2f5905177d4a9b38c390d4d9218ad94c404