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/Android.bp b/tests/hostside/Android.bp
index dfc2f2b..24288ee 100644
--- a/tests/hostside/Android.bp
+++ b/tests/hostside/Android.bp
@@ -13,7 +13,7 @@
         "tradefed",
     ],
     static_libs: [
-        "VirtualizationTestHelper",
+        "MicrodroidHostTestHelper",
     ],
     per_testcase_directory: true,
     data: [