Add soft_audio_configuration_changed_cb_ to handle the streamMap changed

Based on the stream status and Bluetooth Audio Session to switch the
different configuration_changed_cb_ notifcation.

audio_configuration_changed_cb_ for the context type handover case
soft_audio_configuration_changed_cb_ for the streamMap changed during
media stream case

Bug: 231084798
Test: LE audio offload later join and disappear with downmix enable
Change-Id: I199c2b765b128875fb2c66abb1a500e4a6c820b7