Move aconfig-srcjars srcs into shared defaults

This ensures they're consistently added to all droidstubs modules
for the non-updatable part.

Test: presubmit
Change-Id: Ia17808572b3fa8d75cdc71e7981d562ad0036afc
diff --git a/Android.bp b/Android.bp
index 9c2b471..1d11014 100644
--- a/Android.bp
+++ b/Android.bp
@@ -620,6 +620,7 @@
     name: "android-non-updatable-stub-sources",
     srcs: [
         ":framework-mime-sources", // mimemap builds separately but has no separate droidstubs.
+        ":framework-minus-apex-aconfig-srcjars",
         ":framework-non-updatable-sources",
         ":opt-telephony-srcs",
         ":opt-net-voip-srcs",