Virtualizer: Add AIDL placeholder implementation and vts test

Bug: 258124419
Test: atest VtsHalVirtualizerTargetTest

Change-Id: Id286ca2e7e201c065969fa70dc707d6a3a010c97
diff --git a/audio/aidl/vts/Android.bp b/audio/aidl/vts/Android.bp
index 26467c9..58494ca 100644
--- a/audio/aidl/vts/Android.bp
+++ b/audio/aidl/vts/Android.bp
@@ -86,6 +86,12 @@
 }
 
 cc_test {
+    name: "VtsHalVirtualizerTargetTest",
+    defaults: ["VtsHalAudioTargetTestDefaults"],
+    srcs: ["VtsHalVirtualizerTargetTest.cpp"],
+}
+
+cc_test {
     name: "VtsHalVisualizerTargetTest",
     defaults: ["VtsHalAudioTargetTestDefaults"],
     srcs: ["VtsHalVisualizerTargetTest.cpp"],