Configure sepolicy for TracingServiceProxy

Configures sepolicy to allow for the new TracingServiceProxy system
services, and to allow Perfetto to access the service.

Bug: 175591887
Test: Validated the service started successfullyy, and invoked via CLI
Change-Id: Idb6438948a9d96063f8455544b97ef66267cde23
diff --git a/private/service.te b/private/service.te
index 821b740..7f692f3 100644
--- a/private/service.te
+++ b/private/service.te
@@ -8,4 +8,5 @@
 type stats_service,                 service_manager_type;
 type statscompanion_service,        system_server_service, service_manager_type;
 type statsmanager_service,          system_api_service, system_server_service, service_manager_type;
+type tracingproxy_service,          system_server_service, service_manager_type;
 type uce_service,                   service_manager_type;