Remove injecting multi-user settings into settings itself

- It can improve performance because we use less injected item

Bug: 242152448
Test: robotest
Change-Id: I892e1ac9c3f8297c489fc1fec934e9f5f2e2f5e9

src/com/android/settings/users/MultiUserPreferenceController.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.users;
+
+import android.content.Context;
+import android.content.pm.UserInfo;
+import android.os.UserHandle;
+import android.os.UserManager;
+
+import com.android.settings.R;
+import com.android.settings.Utils;
+import com.android.settings.core.BasePreferenceController;
+
+public class MultiUserPreferenceController extends BasePreferenceController {
+
+    public MultiUserPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return (UserHandle.MU_ENABLED && UserManager.supportsMultipleUsers()
+                && !Utils.isMonkeyRunning()) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        UserManager um = mContext.getSystemService(UserManager.class);
+        UserInfo info = um.getUserInfo(UserHandle.myUserId());
+        return mContext.getString(R.string.users_summary, info.name);
+    }
+}