Update cargo README
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Currently there are four different tests for Spectravel connected to Caravel:
* plfg_nco_fft_mag_acc_utx - Data path is: PLFG -> NCO -> FFT -> MAG -> ACC -> UART output Tx
* plfg_nco_fft_mag_acc_pout - Data path is: PLFG -> NCO -> FFT -> MAG -> ACC -> parallel output (8b AXI4-Stream)
-* pin_nco_fft_mag_acc_pout - Data path is: parallel input (8b AXI4-Stream) -> NCO -> FFT -> MAG -> ACC -> parallel output (8b AXI4-Stream)
-* pin_fft_mag_acc_pout - Data path is: parallel input (8b AXI4-Stream) -> FFT -> MAG -> ACC -> parallel output (8b AXI4-Stream)
+* pin_nco_fft_mag_acc_pout - Data path is: inStream (8b AXI4-Stream) -> NCO -> FFT -> MAG -> ACC -> outStream (8b AXI4-Stream)
+* pin_fft_mag_acc_pout - Data path is: inStream (8b AXI4-Stream) -> FFT -> MAG -> ACC -> outStream (8b AXI4-Stream)
All tests contain C code where appropriate Spectravel registers are set in order to obtain desired functionality. Output of the Spectravel is compared with golden model generated with Chisel. In order for test to pass, Spectravel output data must be the same as golden model data.
