Add app_binding system service

Bug: 109809543
Test: Build and boot with the new service in the internal branch.

Change-Id: Iaee365771c3e8e5b8f5f3b6112bbf902c6bb02bd
diff --git a/private/service_contexts b/private/service_contexts
index 804385e..9403300 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -7,6 +7,7 @@
 android.os.UpdateEngineService            u:object_r:update_engine_service:s0
 android.security.keystore                 u:object_r:keystore_service:s0
 android.service.gatekeeper.IGateKeeperService    u:object_r:gatekeeper_service:s0
+app_binding                               u:object_r:app_binding_service:s0
 appops                                    u:object_r:appops_service:s0
 appwidget                                 u:object_r:appwidget_service:s0
 assetatlas                                u:object_r:assetatlas_service:s0