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/noiseSuppression/NoiseSuppressionSw.h b/audio/aidl/default/noiseSuppression/NoiseSuppressionSw.h
index 0c03038..f39d8e5 100644
--- a/audio/aidl/default/noiseSuppression/NoiseSuppressionSw.h
+++ b/audio/aidl/default/noiseSuppression/NoiseSuppressionSw.h
@@ -37,7 +37,7 @@
     NoiseSuppression::Level getLevel();
 
   private:
-    NoiseSuppression::Level mLevel;
+    NoiseSuppression::Level mLevel = NoiseSuppression::Level::LOW;
 };
 
 class NoiseSuppressionSw final : public EffectImpl {