Audio AIDL : Add default value to params

Bug: 258124419
Test: atest VtsHalBassBoostTargetTest
Test: atest VtsHalVirtualizerTargetTest
Test: atest VtsHalVisualizerTargetTest
Test: atest VtsHalAECTargetTest
Test: atest VtsHalAGCTargetTest
Test: atest VtsHalNSTargetTest

Change-Id: Iad68cf01f8a27dfe9ba17584f2c3b43f0d586d86
diff --git a/audio/aidl/default/virtualizer/VirtualizerSw.h b/audio/aidl/default/virtualizer/VirtualizerSw.h
index 05974a8..b4482da 100644
--- a/audio/aidl/default/virtualizer/VirtualizerSw.h
+++ b/audio/aidl/default/virtualizer/VirtualizerSw.h
@@ -45,7 +45,7 @@
     int getVrStrength() const { return mStrength; }
 
   private:
-    int mStrength;
+    int mStrength = 0;
 };
 
 class VirtualizerSw final : public EffectImpl {