Clean up HostStubGen directory

Remove obsolete directories

Test: ./scripts/run-all-tests.sh
Bug: 292141694
Change-Id: I2124831ed61f50effca80c64005eb0933fd87016
diff --git a/Ravenwood.bp b/Ravenwood.bp
index 03f3f0f..f330ad1 100644
--- a/Ravenwood.bp
+++ b/Ravenwood.bp
@@ -65,7 +65,7 @@
 // depend on it.
 java_genrule {
     name: "framework-minus-apex.ravenwood",
-    defaults: ["hoststubgen-for-prototype-only-genrule"],
+    defaults: ["ravenwood-internal-only-visibility-genrule"],
     cmd: "cp $(in) $(out)",
     srcs: [
         ":framework-minus-apex.ravenwood-base{ravenwood.jar}",