Modify the visiblity of the droidstubs of mainline modules

So that the exportable stubs source jar is visible to combined_apis

Test: m docs dist
Bug: 377585897
Change-Id: Id29684159642ee0d8f77a174a1e5ab89529e9f21
diff --git a/sdk/ModuleDefaults.bp b/sdk/ModuleDefaults.bp
index 5e14aba..3e6b6e4 100644
--- a/sdk/ModuleDefaults.bp
+++ b/sdk/ModuleDefaults.bp
@@ -77,7 +77,10 @@
         ":__pkg__",
         "//frameworks/base/api", // For framework-all
     ],
-    stubs_source_visibility: ["//visibility:private"],
+    stubs_source_visibility: [
+        ":__pkg__",
+        "//frameworks/base/api", // For all-modules-public-stubs-source-exportable
+    ],
 
     defaults_visibility: ["//visibility:private"],