Port 397 - Port float MR 2246 to BASOP main

• Link to issue in BASOP repo: #2163 (closed)
• Link to original MR in float repo: ivas-codec-pc/ivas-codec!2246 (merged)
• Requested reviewers: @vasilache @lintervo

Note, I also unified the variable names in ivas_dirac_ana_fx() function.