[DO NOT MERGE] Add A2dpServiceBinderTest

FYI, cherry-picked patch set 2 because of the code difference
between aosp and tm-qpr-dev caused by aosp/2194763.

Bug: 237467631
Test: atest BluetoothInstrumentationTests:A2dpServiceBinderTest
Change-Id: I853cf7c90abb343c1ea0436c948bd6b89f8c81b6
Merged-In: I853cf7c90abb343c1ea0436c948bd6b89f8c81b6
(cherry picked from commit c917a891b3b387e8300a36a992fbde435af0a583)