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Harmonize InitTnsConfiguration_ivas_fx() and InitTnsConfiguration_fx()

Bug description

It seems to be possible to harmonize InitTnsConfiguration_ivas_fx() and InitTnsConfiguration_fx().

Ideally,

InitTnsConfiguration_ivas_fx() should be brought inline with the floating-point code and renamed to InitTnsConfiguration_fx()
the other function could then probably be removed
at the same time, also InitTnsConfigs_ivas_fx() and InitTnsConfigs_fx() could be checked, whether they then can be harmonized