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/BluetoothDetailsHeaderController.java

@@ -16,6 +16,7 @@
 
 package com.android.settings.bluetooth;
 
+import android.bluetooth.BluetoothDevice;
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.util.Pair;
@@ -50,6 +51,12 @@ public class BluetoothDetailsHeaderController extends BluetoothDetailsController
         mDeviceManager = mLocalManager.getCachedDeviceManager();
     }
 
+    @Override
+    public boolean isAvailable() {
+        return !Utils.getBooleanMetaData(mCachedDevice.getDevice(),
+                BluetoothDevice.METADATA_IS_UNTHETHERED_HEADSET);
+    }
+
     @Override
     protected void init(PreferenceScreen screen) {
         final LayoutPreference headerPreference = screen.findPreference(KEY_DEVICE_HEADER);