Refactor testRpcBinderLatency

Use the runVmTestService helper method, report microseconds.

Test: atest MicrodroidBenchmarkApp
Change-Id: I0137f5140144e38ae668bcd8b7a9ee4d161ad99b
diff --git a/tests/benchmark/Android.bp b/tests/benchmark/Android.bp
index 9d2b6c7..dac4993 100644
--- a/tests/benchmark/Android.bp
+++ b/tests/benchmark/Android.bp
@@ -19,6 +19,7 @@
     jni_libs: [
         "MicrodroidBenchmarkNativeLib",
         "MicrodroidIdleNativeLib",
+        "MicrodroidTestNativeLib",
         "libiovsock_host_jni",
     ],
     jni_uses_platform_apis: true,