SVD functions fixed point implementation

EVS 26.444 BE test passes.
pytests results: 597 failed, 381 skipped

MLD scores:
Original inputs:
MLD > 10: 80
MLD > 5 : 140
MLD < 5 : 377

+10dB inputs:
MLD > 10: 215
MLD > 5 : 190
MLD < 5 : 191

-10dB inputs:
MLD > 10: 29
MLD > 5 : 98
MLD < 5 : 470