Set HotwordAudioStreamManager buffer size to 2560

Bug: 244595867
Test: None; minor constant change
Change-Id: I2f0fc99c78bdf00f512e61fc4419b882286f445f

services/voiceinteraction/java/com/android/server/voiceinteraction/HotwordAudioStreamManager.java

@@ -163,7 +163,7 @@ final class HotwordAudioStreamManager {
 
     private static class SingleAudioStreamCopyTask implements Callable<Void> {
         // TODO: Make this buffer size customizable from updateState()
-        private static final int COPY_BUFFER_LENGTH = 1_024;
+        private static final int COPY_BUFFER_LENGTH = 2_560;
 
         private final String mStreamTaskId;
         private final ParcelFileDescriptor mAudioSource;