Bluetooth: ISO: Fix BIS connection dst_type handling

Socket dst_type cannot be directly assigned to hci_conn->type since
there domain is different which may lead to the wrong address type being
used.

Fixes: 6a5ad251 ("Bluetooth: ISO: Fix possible circular locking dependency")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>