Update BT header using BT metadata

As for unthethered headset, get BT data from BT metadata, rather than
CachedBluetoothDevice

Bug: 122460277
Test: RunSettingsRoboTests
Change-Id: Ifb5507cbbce9602726ba272c12d1bf95eff91001

src/com/android/settings/bluetooth/BluetoothDetailsButtonsController.java

@@ -16,6 +16,7 @@
 
 package com.android.settings.bluetooth;
 
+import android.bluetooth.BluetoothDevice;
 import android.content.Context;
 
 import androidx.preference.PreferenceFragmentCompat;
@@ -43,6 +44,13 @@ public class BluetoothDetailsButtonsController extends BluetoothDetailsControlle
         mIsConnected = device.isConnected();
     }
 
+    @Override
+    public boolean isAvailable() {
+        final boolean unthetheredHeadset = Utils.getBooleanMetaData(mCachedDevice.getDevice(),
+                BluetoothDevice.METADATA_IS_UNTHETHERED_HEADSET);
+        return !unthetheredHeadset;
+    }
+
     private void onForgetButtonPressed() {
         ForgetDeviceDialogFragment fragment =
                 ForgetDeviceDialogFragment.newInstance(mCachedDevice.getAddress());