The structure and calling of the function `pre_proc_ivas()` are different between FLP and BASOP. Main differences are: * exception for SBA in the function call * difference around calling configureFdCngEnc() * obsolete buffer init. operations in BASOP The goal is to align FLP and BASOP codes for the pre-processing. <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary.-->