LeAudio/Broadcaster: Improve audio location selection

With this we select proper audio location when configs are split
into two subconfigs (when one BIS has different parameters than the
other).

Bug: 308428644
Bug: 313054645
Test: atest bluetooth-test-audio-hal-le-audio-software bluetooth-test-audio-hal-aidl-leaudio-utils bluetooth_le_audio_test bluetooth_le_audio_client_test bluetooth_test_broadcaster bluetooth_test_broadcaster_state_machine bluetooth_le_audio_codec_manager_test
Change-Id: I3921e6e3ff5b72547a1f7573c6296928cfb87386