Division and modulus operator optimizations - 1

[x] Replaced get_next_indice_1, get_next_indice and sr2fscale with get_next_indice_1_fx, get_next_indice_fx and sr2fscale_fx respectively

Pipeline results:

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 35
  MLD > 5 : 85
  MLD < 5 : 442
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 146
  MLD > 5 : 188
  MLD < 5 : 228
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 8
  MLD > 5 : 41
  MLD < 5 : 513
• encoder pytests results:
  MLD scores:
  Original inputs: 562 tests:
  MLD > 10: 15
  MLD > 5 : 47
  MLD < 5 : 500
  +10dB inputs: 562 tests:
  MLD > 10: 44
  MLD > 5 : 128
  MLD < 5 : 390
  -10dB inputs: 562 tests:
  MLD > 10: 5
  MLD > 5 : 21
  MLD < 5 : 536