audio_hal_interface: Check support for a2dp hw offload v2

Codec extensilbity is dependent on the controller support
for the vendor command a2dp hw offload v2;
this change disables codec extensibility if controller
support is missing.

Bug: 321519717
Bug: 308686081
Test: m com.android.btservices
Change-Id: I070c79f09219111490a16e1424bbe37a066c96fb