Add layout for advanced BT detail header

If device supports metadata, then we display advanced UI in Bluetooth
details header. This CL adds layout for this header.

In advanced layout, it will show:
1. Device name
2. Left, right and case icon
3. Left, right and case battery level

Once API is ready, following CL will get metadata from it and set it
to UI.
Bug: 122460277
Test: RunSettingsRoboTests
Change-Id: Ide044cf9705f350b431b2cb3a9ad82cc4425a17e

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

@@ -90,4 +90,4 @@ public class BluetoothDetailsButtonsController extends BluetoothDetailsControlle
         return KEY_ACTION_BUTTONS;
     }
 
-}
+}