Fix issues in BT detail header

1. Update isAvailable() in controller
2. Update method to get fast pair icon

Bug: 124455912
Test: RunSettingsRoboTests
Change-Id: I24a04c8c91d74e9b8b7e8746ad6279fafa37f0a9

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

@@ -16,7 +16,6 @@
 
 package com.android.settings.bluetooth;
 
-import android.bluetooth.BluetoothDevice;
 import android.content.Context;
 
 import androidx.preference.PreferenceFragmentCompat;
@@ -44,13 +43,6 @@ 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());