Use -Werror in hardware/interfaces/audio

* Remove unused variables, lambda function parameters..

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I28e8eb1af434f62cab6f41285b9a400f7f57cd13
diff --git a/audio/effect/2.0/default/Android.bp b/audio/effect/2.0/default/Android.bp
index 79bb8b0..e1072b4 100644
--- a/audio/effect/2.0/default/Android.bp
+++ b/audio/effect/2.0/default/Android.bp
@@ -1,5 +1,6 @@
 cc_library_shared {
     name: "android.hardware.audio.effect@2.0-impl",
+    defaults: ["hidl_defaults"],
     vendor: true,
     relative_install_path: "hw",
     srcs: [