Reference libcore, conscrypt and icu sources directly

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

Bug: 153306490
Test: m nothing
Bug: 142935992
Merged-In: Ia15c3ceb9fc59e7945687536c60ce265ec95781e
Change-Id: Ia15c3ceb9fc59e7945687536c60ce265ec95781e
(cherry picked from commit 5c89e70a)

ApiDocs.bp

@@ -65,8 +65,9 @@ stubs_defaults {
         "test-base/src/**/*.java",
         ":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",
         "test-mock/src/**/*.java",
         "test-runner/src/**/*.java",
     ],

StubLibraries.bp

@@ -47,8 +47,9 @@ stubs_defaults {
         "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",
     ],
     // TODO(b/147699819): remove below aidl includes.
     aidl: {