[Hearing device shortcut] Setup shortcut for hearing device

* Hearing aids page need to set restricted mode to DISALLOW_CONFIG_BLUETOOTH, so change AccessibilityShortcutPreferenceFragment to extend RestrictedDashboardFragment
* move ShortcutPreference under the device control category for the 1st order

Bug: 237625815
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilityShortcutPreferenceFragmentTest
Change-Id: I13da8d979694aeab76d8a10edf1348c0ee7810f6

src/com/android/settings/gestures/OneHandedSettings.java

@@ -48,6 +48,13 @@ public class OneHandedSettings extends AccessibilityShortcutPreferenceFragment {
     private String mFeatureName;
     private OneHandedSettingsUtils mUtils;
 
+    /**
+     * One handed settings no need to set any restriction key for pin protected.
+     */
+    public OneHandedSettings() {
+        super(/* restrictionKey= */ null);
+    }
+
     @Override
     protected void updatePreferenceStates() {
         OneHandedSettingsUtils.setUserId(UserHandle.myUserId());