Always use audio_configuration_changed_cb_ to notify the config update

There is a new API `isStreamActive` can indicate the stream handle
state. We don't need to use soft_audio_configuration_change_cb to
update the connection map and audio location

Bug: 249614160
Bug: 277857154
Test: LE audio offload disappear and later join with downmix enable
Change-Id: I02357ebe09425525e356ba0f793a3f081953d866