Move util classes to their destination package

Test: builds
Change-Id: I93e9cfd968e08f983e3fd9f7196c455c79a0f32d
(cherry picked from commit 7c9c12694aec7d688496a634f165661e0681773e)
diff --git a/staticlibs/devicetests/com/android/testutils/TapPacketReader.java b/staticlibs/devicetests/com/android/testutils/TapPacketReader.java
index c36f144..52c4cc9 100644
--- a/staticlibs/devicetests/com/android/testutils/TapPacketReader.java
+++ b/staticlibs/devicetests/com/android/testutils/TapPacketReader.java
@@ -16,13 +16,13 @@
 
 package com.android.testutils;
 
-import android.net.util.PacketReader;
 import android.os.Handler;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.net.module.util.ArrayTrackRecord;
+import com.android.net.module.util.PacketReader;
 
 import java.io.FileDescriptor;
 import java.io.FileOutputStream;