Resolve "Harmonize configureFdCngDec_fx"

Fabian Bauerrequested to merge
basop-2499-harmonize-configurefdcngdec_fx into main

Reason why this change is needed

  • Harmonize configureFdCngDec_fx and configureFdCngDec_ivas_fx into a single function to diminish maintenance effort

Closes #2499 (closed)

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