Add preference for Ambient Play

- Updated for Pie by @spezi77

@jhenrique09 edits:

* Cleanup code
* Add notification toggle

Change-Id: I49a5d4b066cbe51b2be3c0808de6d880fa2f6fa0
Signed-off-by: DennySPB <dennyspb@gmail.com>
Signed-off-by: Mihran Thalhath <mihranz7@gmail.com>
16 files changed