BASOP encoder: Improve WMOPS performance of ivas_band_cov

Basic info

The code in lib_enc/ivas_enc_cov_handler/ivas_band_cov() can be improved further.

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

Bug description

Ways to reproduce

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