Add incidentcompanion service.

It is a side channel for dumpstate and incidentd to communicate
status and get user authorization to share bugreports by calling
system_server.

Test: atest PermissionControllerTest / atest GooglePermissionControllerTest
Change-Id: I995a43a25f375e5c97dba1deb92ebe893ca8585d
diff --git a/private/service.te b/private/service.te
index fc9a95a..84e524d 100644
--- a/private/service.te
+++ b/private/service.te
@@ -1,3 +1,4 @@
-type gsi_service,               service_manager_type;
-type stats_service, service_manager_type;
-type statscompanion_service, system_server_service, service_manager_type;
+type gsi_service,                   service_manager_type;
+type incidentcompanion_service,     system_api_service, system_server_service, service_manager_type;
+type stats_service,                 service_manager_type;
+type statscompanion_service,        system_server_service, service_manager_type;