Sort imports

Having consistent import order will reduce chance of merge
conflict between internal and external master

Test: rebuild
Change-Id: I0b1a170967ddcce7f388603fd521f6ed1eeba30b

tests/robotests/src/com/android/settings/widget/AppCheckBoxPreferenceTest.java

@@ -22,6 +22,8 @@ import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 
+import androidx.preference.PreferenceViewHolder;
+
 import com.android.settings.R;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
 
@@ -30,8 +32,6 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RuntimeEnvironment;
 
-import androidx.preference.PreferenceViewHolder;
-
 @RunWith(SettingsRobolectricTestRunner.class)
 public class AppCheckBoxPreferenceTest {