Update the imports to androidx.test.filters.*

Bug: 316941721
Test: mmma .
Change-Id: I636f8e88cff63da46a3cca8865df9cf680f2684e

packages/Shell/tests/src/com/android/shell/UtilitiesTest.java

@@ -15,10 +15,12 @@
  */
 package com.android.shell;
 
-import android.test.suitebuilder.annotation.SmallTest;
-import junit.framework.TestCase;
 import static com.android.shell.BugreportProgressService.isValid;
 
+import androidx.test.filters.SmallTest;
+
+import junit.framework.TestCase;
+
 @SmallTest
 public class UtilitiesTest extends TestCase {