Rename VirtualizationTestHelper to MicrodroidHostTestHelper

This is a common base class for Microdroid host tests. Make the name
reflect the purpose.

Test: m MicrodroidHostTestCases
Change-Id: I746d76205c9c26ce71f5e8c1025257bf6057f913
diff --git a/tests/hostside/helper/Android.bp b/tests/hostside/helper/Android.bp
index 6ab02f8..f7caca2 100644
--- a/tests/hostside/helper/Android.bp
+++ b/tests/hostside/helper/Android.bp
@@ -3,7 +3,7 @@
 }
 
 java_library_host {
-    name: "VirtualizationTestHelper",
+    name: "MicrodroidHostTestHelper",
     srcs: ["java/**/*.java"],
     libs: [
         "compatibility-tradefed",