Add defaults for framework stub libs

Useful to be able to change settings for all stub libs at
the same time. For example, disting these libraries will be
done soon.

Bug: 149293194
Test: followup CLs
Change-Id: I4dda5b44b6d4e76018acb50f46d05816cc4c7f0b

apex/Android.bp

diff --git a/apex/Android.bp b/apex/Android.bp
index cd34f98..e8f6e6b 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -84,6 +84,24 @@
     },
 }
 
+java_defaults {
+    name: "framework-module-stubs-lib-defaults-publicapi",
+    installable: false,
+    sdk_version: "module_current",
+}
+
+java_defaults {
+    name: "framework-module-stubs-lib-defaults-systemapi",
+    installable: false,
+    sdk_version: "module_current",
+}
+
+java_defaults {
+    name: "framework-module-stubs-lib-defaults-module_libs_api",
+    installable: false,
+    sdk_version: "module_current",
+}
+
 // The defaults for module_libs comes in two parts - defaults for API checks
 // and defaults for stub generation. This is because we want the API txt
 // files to *only* include the module_libs_api, but the stubs to include