Add network watchlist service SELinux policy rules

Bug: 63908748
Test: built, flashed, able to boot
Change-Id: I3cfead1d687112b5f8cd485c8f84083c566fbce2
diff --git a/private/service_contexts b/private/service_contexts
index ac7fb8e..bc7e3e0 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -40,6 +40,7 @@
 diskstats                                 u:object_r:diskstats_service:s0
 display                                   u:object_r:display_service:s0
 netd_listener                             u:object_r:netd_listener_service:s0
+network_watchlist                         u:object_r:network_watchlist_service:s0
 DockObserver                              u:object_r:DockObserver_service:s0
 dreams                                    u:object_r:dreams_service:s0
 drm.drmManager                            u:object_r:drmserver_service:s0