Improve consistency of prebuilt android.test.runner with source

Adds android.test.base and android.test.mock to the libs property of
the prebuilt android.test.runner to be consistent with the source
module.

Bug: 148080325
Test: m nothing
      TARGET_BUILD_APPS=Camera2 m

Change-Id: I8ac657ed80989acc80b2df579fa011b3ce70383f
diff --git a/current/Android.bp b/current/Android.bp
index 0fc48b1..45a7b78 100644
--- a/current/Android.bp
+++ b/current/Android.bp
@@ -8,6 +8,10 @@
     name: "android.test.runner",
     jars: ["public/android.test.runner.jar"],
     sdk_version: "current",
+    libs: [
+        "android.test.base",
+        "android.test.mock",
+    ],
 }
 
 java_sdk_library_import {