BluetoothLeAudio: Adjust to new APIs

We had to move from Intents to callback on the API which was used by
Telecom. This patch adjust to new API.

Bug: 218799288
Bug: 150670922
Test: atest TelecomUnitTest
sponsor: @jpawlowski
Change-Id: If05a096daacee42cbd1febb92239f81e0c0f5d30
3 files changed