Remove wrapper for BluetoothA2dp

Remove BluetoothA2dpWrapper,
Use BluetoothA2dp to replace all of them.

Bug: 76167422
Change-Id: I2a55677eb8ce4ef62008aa06929b0b78515b28e5
Merged-In: I2a55677eb8ce4ef62008aa06929b0b78515b28e5
Test: RunSettingsLibRoboTests
3 files changed