EnvironmentalReverb: Add AIDL placeholder implementation and its unit test

Bug: 258124419
Test: atest VtsHalEnvironmentalReverbTargetTest

Change-Id: I4bb3ef907be726fbfbcd905db9c304b8ac42ecdd
diff --git a/audio/aidl/vts/Android.bp b/audio/aidl/vts/Android.bp
index aeff615..549d27b 100644
--- a/audio/aidl/vts/Android.bp
+++ b/audio/aidl/vts/Android.bp
@@ -80,6 +80,12 @@
 }
 
 cc_test {
+    name: "VtsHalEnvironmentalReverbTargetTest",
+    defaults: ["VtsHalAudioTargetTestDefaults"],
+    srcs: ["VtsHalEnvironmentalReverbTargetTest.cpp"],
+}
+
+cc_test {
     name: "VtsHalEqualizerTargetTest",
     defaults: ["VtsHalAudioTargetTestDefaults"],
     srcs: ["VtsHalEqualizerTargetTest.cpp"],