[hearing devices page][Audio routing] Add feature flag to control visibility of the hearing device controls and audio output

* Setup basic xml for hearing device controls and audio output in bluetooth detail device page.
* Use same PreferenceCategory with spatial audio and rename to
  `feature_controls_group`

Bug: 237625815
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothDetailsHearingDeviceControlsControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothDetailsAudioRoutingControllerTest
Change-Id: Ibe71757b53b9d65c6ab6efa1053d035e78882b68

tests/robotests/src/com/android/settings/bluetooth/BluetoothDetailsAudioRoutingControllerTest.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2022 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.bluetooth;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.when;
+
+import android.util.FeatureFlagUtils;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link BluetoothDetailsAudioRoutingController}. */
+@RunWith(RobolectricTestRunner.class)
+public class BluetoothDetailsAudioRoutingControllerTest extends
+        BluetoothDetailsControllerTestBase {
+    @Rule
+    public final MockitoRule mockito = MockitoJUnit.rule();
+
+    private BluetoothDetailsAudioRoutingController mController;
+
+    @Override
+    public void setUp() {
+        super.setUp();
+
+        mController = new BluetoothDetailsAudioRoutingController(mContext, mFragment, mCachedDevice,
+                mLifecycle);
+        mController.init(mScreen);
+    }
+
+    @Test
+    public void isAvailable_isHearingAidDevice_available() {
+        FeatureFlagUtils.setEnabled(mContext,
+                FeatureFlagUtils.SETTINGS_AUDIO_ROUTING, true);
+        when(mCachedDevice.isHearingAidDevice()).thenReturn(true);
+
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void isAvailable_isNotHearingAidDevice_notAvailable() {
+        FeatureFlagUtils.setEnabled(mContext,
+                FeatureFlagUtils.SETTINGS_AUDIO_ROUTING, true);
+        when(mCachedDevice.isHearingAidDevice()).thenReturn(false);
+
+        assertThat(mController.isAvailable()).isFalse();
+    }
+}