We plan on migrating MetricsLogger to write to statsd socket. So we need to
allow zygote, which writes to logd using MetricsLogger, to also be able
to statsd. We also re-locate some sepolicies to write to statsd socket
in their respective policy definitions.

Bug: 110537511
Test: no failure/violations observed
Change-Id: I21fd352a25ed946516f9a45ac3b5e9bf97b059bc