Move java_api_contributions closer to their source

These don't need to be defined in the top level Android.bp. Move
them into the directory where the files live.

Bug: 271563074
Test: m
Change-Id: I104374e49ba62de50016aa4a22173d5dbd00c257

Android.bp

@@ -619,12 +619,3 @@ build = [
     "ProtoLibraries.bp",
     "TestProtoLibraries.bp",
 ]
-
-java_api_contribution {
-    name: "api-stubs-docs-non-updatable-public-stubs",
-    api_surface: "public",
-    api_file: "core/api/current.txt",
-    visibility: [
-        "//build/orchestrator/apis",
-    ],
-}

StubLibraries.bp

@@ -610,12 +610,3 @@ java_library {
     ],
     visibility: ["//visibility:public"],
 }
-
-java_api_contribution {
-    name: "frameworks-base-core-api-module-lib-stubs",
-    api_surface: "module-lib",
-    api_file: "core/api/module-lib-current.txt",
-    visibility: [
-        "//build/orchestrator/apis",
-    ],
-}

core/api/Android.bp

@@ -65,3 +65,21 @@ filegroup {
         "//cts/tests/signature/api",
     ],
 }
+
+java_api_contribution {
+    name: "api-stubs-docs-non-updatable-public-stubs",
+    api_surface: "public",
+    api_file: "current.txt",
+    visibility: [
+        "//build/orchestrator/apis",
+    ],
+}
+
+java_api_contribution {
+    name: "frameworks-base-core-api-module-lib-stubs",
+    api_surface: "module-lib",
+    api_file: "module-lib-current.txt",
+    visibility: [
+        "//build/orchestrator/apis",
+    ],
+}