[Physical Keyboard] Add intent support for PK layout setting page

This is part of feature for keyboard setting update, which allows gBoard to deep link to layout picker page.
document: go/deeplink_pk_layout_picker

Change-Id: I4277e175be7eed338f855e8144b5531c614e2c04
Bug: 318594345
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Test: verified on Device
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index cb4358f..d5cf9aa 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -92,6 +92,9 @@
     public static class AvailableVirtualKeyboardActivity extends SettingsActivity { /* empty */ }
     public static class KeyboardLayoutPickerActivity extends SettingsActivity { /* empty */ }
     public static class PhysicalKeyboardActivity extends SettingsActivity { /* empty */ }
+    public static class PhysicalKeyboardLayoutPickerActivity extends SettingsActivity {
+        /* empty */
+    }
     public static class InputMethodAndSubtypeEnablerActivity extends SettingsActivity { /* empty */ }
     public static class SpellCheckersSettingsActivity extends SettingsActivity { /* empty */ }
     public static class LocalePickerActivity extends SettingsActivity { /* empty */ }