Add a new(Empty) system service for AppFunctions project

A.K.A: Maestro

Flag: android.app.appfunctions.flags.enable_app_function_manager
BUG: 357551503
Test: Setup device with new service. No crash :).

Change-Id: I27e1782181ecda5f80574b1109c18e1d40608754
diff --git a/services/Android.bp b/services/Android.bp
index ded7379..0006455 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -120,6 +120,7 @@
         ":services.backup-sources",
         ":services.companion-sources",
         ":services.contentcapture-sources",
+        ":services.appfunctions-sources",
         ":services.contentsuggestions-sources",
         ":services.contextualsearch-sources",
         ":services.coverage-sources",
@@ -217,6 +218,7 @@
         "services.autofill",
         "services.backup",
         "services.companion",
+        "services.appfunctions",
         "services.contentcapture",
         "services.contentsuggestions",
         "services.contextualsearch",