Volume Control: Add tests to validate Volume Control Effect

Added test to apply level, mute and unmute input.
Added test to verify decreasing volume levels.

Bug: 305866207
Test: atest VtsHalVolumeTargetTest
Change-Id: Ie105a3bb77255da61719d042cbd5abc23c405d93
diff --git a/audio/aidl/vts/Android.bp b/audio/aidl/vts/Android.bp
index 5218fdd..d219fa4 100644
--- a/audio/aidl/vts/Android.bp
+++ b/audio/aidl/vts/Android.bp
@@ -26,6 +26,7 @@
         "android.hardware.common.fmq-V1-ndk",
         "libaudioaidlcommon",
         "libaidlcommonsupport",
+        "libpffft",
     ],
     header_libs: [
         "libaudioaidl_headers",
@@ -36,6 +37,7 @@
         "-Wextra",
         "-Werror",
         "-Wthread-safety",
+        "-Wno-error=unused-parameter",
     ],
     test_config_template: "VtsHalAudioTargetTestTemplate.xml",
     test_suites: [