Reorder and clean up imports.

Test: rebuild
Change-Id: I178485c84ae7146f991fd77b6d7504b029942a68

src/com/android/settings/datetime/timezone/RegionZonePreferenceController.java

@@ -17,10 +17,11 @@
 package com.android.settings.datetime.timezone;
 
 import android.content.Context;
-import androidx.preference.Preference;
 
 import com.android.settings.R;
 
+import androidx.preference.Preference;
+
 public class RegionZonePreferenceController extends BaseTimeZonePreferenceController {
     private static final String PREFERENCE_KEY = "region_zone";