Harmonization of signal classification

Basic info

• Float reference:
  • Encoder (float):
  • Decoder (float):
• Fixed point:
  • Encoder (fixed): cf7f073c
  • Decoder (fixed):

Bug description

Most of the code is reuse between signal_clas_fx and signal_clas_ivas_fx, it is suggested to harmonise them to easy maintenance

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-xxxx