FFT functions and EVS Helper functions
[x] Some EVS helper functions imported. [x] Converted DoFFT and fft functions to fixed point. [x] Saturation overflow to be taken care at all calling locations of FFT.
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[x] Some EVS helper functions imported. [x] Converted DoFFT and fft functions to fixed point. [x] Saturation overflow to be taken care at all calling locations of FFT.