SUW: improve navigation on D-pad devices

* Set the initial focus on a usable view instead of a whole layout.
* Set the next focus of the locale selector to next-button.

Change-Id: I4a16127c24e87b52e38892882e44b3a8d24b779b

src/org/lineageos/setupwizard/BaseSetupWizardActivity.java

@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2016 The CyanogenMod Project
- * Copyright (C) 2017-2021 The LineageOS Project
+ *               2017-2022 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -247,6 +247,10 @@ public abstract class BaseSetupWizardActivity extends Activity implements Naviga
         }
     }
 
+    public Button getNextButton() {
+        return mNavigationBar.getNextButton();
+    }
+
     protected void setSkipText(int resId) {
         if (mNavigationBar != null) {
             mNavigationBar.getSkipButton().setText(resId);