audio: Make I/O operations in default stub more realistic

1. Increase the minimum buffer size to 256 frames. This is
   more realistic than 16 frames: 256 frames is ~5ms @ 48 kHz.

2. Make transfer delay in the stub module dependent on the frame
   count for synchronous transfers.

Bug: 270154517
Test: atest VtsHalAudioCoreTargetTest
Test: atest android.media.audio.cts.LoudnessEnhancerTest (w/AIDL enabled)
Change-Id: If968e30d145b52220f4dc3c33af48dbc163c78cd
diff --git a/audio/aidl/default/Android.bp b/audio/aidl/default/Android.bp
index ea00dcb..8bacbb3 100644
--- a/audio/aidl/default/Android.bp
+++ b/audio/aidl/default/Android.bp
@@ -13,6 +13,7 @@
     shared_libs: [
         "libalsautilsv2",
         "libaudioaidlcommon",
+        "libaudioutils",
         "libbase",
         "libbinder_ndk",
         "libcutils",