A2DP switch device refactor

Bluetooth stack is no longer abled to re-enable the Session.
This will be done by a re-open of the Audio data path.

Test: Manual
Tag: #refactor
Bug: 190422401
Merged-In: Ie9e9b1b0c0ed392458401995eea8d8cdd9d7401a
Change-Id: Ie9e9b1b0c0ed392458401995eea8d8cdd9d7401a