Expose the regional preferences page

 - Settings -> language & input -> Regional preferences

Bug: b/246929960
Test: atest pass.
Change-Id: I650111147a95a09b3b52518e6369ede0a4275857
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index cea4cc6..0c58fff 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -114,6 +114,8 @@
     public static class LocalePickerActivity extends SettingsActivity { /* empty */ }
     public static class LanguageAndInputSettingsActivity extends SettingsActivity { /* empty */ }
     public static class LanguageSettingsActivity extends SettingsActivity { /* empty */ }
+    /** Activity for the regional preferences settings. */
+    public static class RegionalPreferencesActivity extends SettingsActivity { /* empty */ }
     public static class KeyboardSettingsActivity extends SettingsActivity { /* empty */ }
     public static class UserDictionarySettingsActivity extends SettingsActivity { /* empty */ }
     public static class DarkThemeSettingsActivity extends SettingsActivity { /* empty */ }