Updates to IVAS commented code in EVS

[x] bpf_pitch_coherence_fx (bass_psfilter.c):
function is tested through pytest conformance testing and all the test are passing (prepare pytest+run pytest).
Moved and removed few evs functions.

[x] add_pulses_L_subfr_fx (dec4t64_fx.c):
function not getting covered by any of the ivas test stream. Currently untested.

[x] dec_acelp_fast_fx (dec4t64_fx.c):
tested through pytest conformance testing all the test passing but the coverage of the statements of the function is not 100% thus
few else and if statements are left untested

[x] tcx5SpectrumInterleaving_fx (codec_tcx_common.c):
unit testing done for random input

[x] txc5SpectrumDeinterleaving_fx (codec_tcx_common.c):
unit testing done for random input

[x] tcx5TnsGrouping_fx (codec_tcx_common.c):
unit testing done for random input

[x] tcx5TnsUngrouping_fx (codec_tcx_common.c):

[x] dec_1p_N1_L_subfr (dec4t64_fx.c):
no floating point operation, only cosmetic changes.