Add support for new media notification controls configuration to support 3 icons (if room).

[geekygecko]

Description

Recently the ability to configure your media notification controls was added. Unfortunately, it changed the notification from three to two controls, so user's have mentioned they have lost the mark as played control.

We used to offer three controls, playback speed, star, and mark as played. The Android playback notification only shows two controls but Android Auto uses three controls.

Before

After

It would be good to support three controls but it might be more difficult to implement the configuration page as we might want to let the user choose the positions so the user's least favourite control is removed.

Step-by-step reproduction instructions

1. Follow the steps to set up an Android Auto emulator https://developer.android.com/training/cars/testing#test-auto
2. Deploy the app to a phone
3. Connect the phone using USB
4. Play an episode
5. Open the full screen playing screen

The mark as played control will be missing.