Updates messages for hearing devices related page

1. Removes the footer in hearing devices page
2. Moves the footer message to top intro of hearing devices pairing
   page

Bug: 321840161
Test: build pass, only simple UI change
Change-Id: I0554f0e6d12f78c1df3efba23792e9c0dc3f061f

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

@@ -1,35 +0,0 @@
-/*
- * 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.accessibility;
-
-import android.content.Context;
-
-import com.android.settings.R;
-
-/** Preference controller for footer in pair hearing device page. */
-public class PairHearingDeviceFooterPreferenceController extends
-        AccessibilityFooterPreferenceController {
-    public PairHearingDeviceFooterPreferenceController(Context context,
-            String key) {
-        super(context, key);
-    }
-
-    @Override
-    protected String getIntroductionTitle() {
-        return mContext.getString(R.string.accessibility_pair_hearing_device_about_title);
-    }
-}