Fix visibility of some modules

Test: ./ravenwood/scripts/run-ravenwood-tests.sh
Bug: 292141694
Change-Id: Id1809a2ca08e78a881902fe7e6ade9d139ea0b71
diff --git a/Ravenwood.bp b/Ravenwood.bp
index c3b22c4..7c7c0e2 100644
--- a/Ravenwood.bp
+++ b/Ravenwood.bp
@@ -168,6 +168,7 @@
         "services.core.ravenwood",
     ],
     jarjar_rules: ":ravenwood-services-jarjar-rules",
+    visibility: ["//visibility:private"],
 }
 
 java_library {
@@ -179,6 +180,7 @@
         "services.core.ravenwood",
     ],
     jarjar_rules: ":ravenwood-services-jarjar-rules",
+    visibility: ["//visibility:private"],
 }
 
 java_library {