sepolicy: support wigig services

For managing the wigig network, define wigig services as
system service and allow access to wpa_wigig0 control socket.

wigig supplicant creates sockets under /data/misc/wifi/wigig_sockets.

CRs-Fixed: 997409
Change-Id: I8113892b7fdbf1a4f7dd4b9c7cf490264952fe69