sepolicy: add rules for wigig network performance tuner(npt)

Add rules needed to support the wigig network performance tuner.
The npt is a standalone service which provides the ability to
tune network stack parameters. It can accumulate tuning requests
from multiple clients and merge requests.
The npt provides an hwbinder service used by wigig framework
(hosted inside system_server).
The npt also listens on a unix socket, this is used by vendor
components for backward compatibility with previous implementation.

Change-Id: Iaabb4c13519c14b0e79631c7eaed7e53a1076063