Add the skeleton for the client-side API

android.system.virtualmachine is added as the client-side API for the
controlling of virtual machines. This change doesn't add any new API.
It adds an empty library to the existing framework.

Bug: 183496040
Test: atest MicrodroidHostTestCases
Change-Id: I9c52dfaf7e33137e5e3d6c587b5cc3932f667025
diff --git a/tests/testapk/Android.bp b/tests/testapk/Android.bp
index fc5681e..f14fca8 100644
--- a/tests/testapk/Android.bp
+++ b/tests/testapk/Android.bp
@@ -5,6 +5,9 @@
 android_app {
     name: "MicrodroidTestApp",
     srcs: ["src/java/**/*.java"],
+    libs: [
+        "android.system.virtualmachine",
+    ],
     jni_libs: ["MicrodroidTestNativeLib"],
     platform_apis: true,
     use_embedded_native_libs: true,