IVAS encoder functions converted to fixed

[x] Converted all functions in ivas_stereo_adapt_GR_enc.c file
[x] Converted functions in LFE low pass filter path
[x] Fixed implementation for subfunctions of ivas_ism_enc

EVS 26.444 BE test passes.
decoder pytests:
MLD scores:
Original inputs: 562 failed, 374 skipped
MLD > 10: 46
MLD > 5 : 108
MLD < 5 : 408
+10dB inputs: 562 failed, 374 skipped
MLD > 10: 168
MLD > 5 : 190
MLD < 5 : 204
-10dB inputs: 562 failed, 374 skipped
MLD > 10: 13
MLD > 5 : 48
MLD < 5 : 501

encoder pytests results:
MLD scores:
Original inputs: 562 tests: 90 passes, 472 failures, 374 skipped
MLD > 10: 16
MLD > 5 : 30
MLD < 5 : 516
+10dB inputs: 562 tests: 90 passes, 472 failures, 374 skipped
MLD > 10: 26
MLD > 5 : 87
MLD < 5 : 449
-10dB inputs: 562 tests: 76 passes, 486 failures, 374 skipped
MLD > 10: 5
MLD > 5 : 19
MLD < 5 : 538