Reference libcore, conscrypt and icu sources directly

Avoids an extra aggregation step in the creation of the API sources.

Test: m nothing
Bug: 142935992
Change-Id: Ia15c3ceb9fc59e7945687536c60ce265ec95781e
diff --git a/StubLibraries.bp b/StubLibraries.bp
index fccb258..f081071 100644
--- a/StubLibraries.bp
+++ b/StubLibraries.bp
@@ -47,8 +47,9 @@
         "core/java/**/*.logtags",
         ":opt-telephony-srcs",
         ":opt-net-voip-srcs",
-        ":core-current-stubs-source",
-        ":core_public_api_files",
+        ":art-module-public-api-stubs-source",
+        ":conscrypt-module-public-api-stubs-source",
+        ":android_icu4j_public_api_files",
     ],
     libs: ["framework-internal-utils"],
     installable: false,