leaudio: Fix removing data path

So far when CIS was disconnected with different reason than
HCI_ERR_CONN_CAUSE_LOCAL_HOST, then datapath was removed.

State Machine was not doing that when reason
HCI_ERR_CONN_CAUSE_LOCAL_HOST because when disconenction is intiated by
LeAudio, then datapath is already removed.

However it might happen that ACL can be disconnected by other module of
Bluetooth stack e.g. timeout on GATT transaction. In such a case,
controller will notify Host about CIS disconnection and ACL
disconnection with the reason HCI_ERR_CONN_CAUSE_LOCAL_HOST.

In this case, LeAudio shall clear data path.

Bug: 308095683
Test: atest bluetooth_le_audio_test
Tag: #feature
Change-Id: If698a2a05bd7ebdd0ea8ceae23fe0e4efe461317