Support accessibility shortcut secondary action (11/n)

Refactor current shortcut design to base fragment and provide
protected function to customize the legacy design,
magnification or no need shortcut app.

Bug: 142530063
Bug: 142531156
Test: make RunSettingsRoboTests2

Change-Id: I51c951ef8f819a1940ddfe33b009b40ed5ec0530

src/com/android/settings/accessibility/AccessibilityShortcutPreferenceFragment.java

@@ -26,6 +26,7 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.UserHandle;
 import android.provider.Settings;
+import android.view.View;
 import android.view.accessibility.AccessibilityManager;
 import android.widget.Switch;
 
@@ -83,6 +84,12 @@ public class AccessibilityShortcutPreferenceFragment extends ToggleFeaturePrefer
         });
     }
 
+    @Override
+    public void onViewCreated(View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        mShortcutPreference.setVisible(false);
+    }
+
     @Override
     public void onResume() {
         super.onResume();