Start VirtualizationService on demand.

Bug: 183582651
Test: atest VirtualizationTestCases
Change-Id: If6cec89206492cf9818a586d9439ebdb62f27342
diff --git a/tests/common.cc b/tests/common.cc
index fbda6c6..a9f0807 100644
--- a/tests/common.cc
+++ b/tests/common.cc
@@ -19,10 +19,9 @@
 namespace virt {
 
 void VirtualizationTest::SetUp() {
-    status_t err =
-            getService<IVirtualizationService>(String16("android.system.virtualizationservice"),
-                                               &mVirtualizationService);
-    ASSERT_EQ(err, 0);
+    mVirtualizationService = waitForService<IVirtualizationService>(
+            String16("android.system.virtualizationservice"));
+    ASSERT_NE(mVirtualizationService, nullptr);
 }
 
 } // namespace virt