[test] Move runVmAttestationService method to device test base

This allows us to reuse the method in MicrodroidTests later for
VM attestation CTS tests.

Bug: 329652894
Test: atest AvfRkpdVmAttestationTestApp
Change-Id: Icd2eef6bfb2d358b0134dcc8700f8b7794c34fdf
diff --git a/tests/helper/Android.bp b/tests/helper/Android.bp
index 614c70c..41d1ba2 100644
--- a/tests/helper/Android.bp
+++ b/tests/helper/Android.bp
@@ -16,6 +16,7 @@
         "androidx.test.runner",
         "androidx.test.ext.junit",
         "com.android.microdroid.testservice-java",
+        "com.android.virt.vm_attestation.testservice-java",
         "MicrodroidTestHelper",
         "truth",
     ],