Issue #2435 "Harmonize WriteTnsData*_fx(), EncodeTnsData*_fx()"

• Related issues: #2435 (closed)
• Requested reviewers: @multrus

Reason why this change is needed

• Harmonize WriteTnsData*_fx(), EncodeTnsData*_fx(), which are basically identical

Description of the change

• Harmonize WriteTnsData_fx() and WriteTnsData_ivas_fx()
• Harmonized EncodeTnsData_fx() and EncodeTnsData_ivas_fx()

Affected operating points

• All operating points are BE

  close #2435 (closed)