[otbn/tvla] Add batch mode for OTBN vertical ecc256 keygen capture #128
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This commit adds
The batch mode increases the capture rate, compared to non-batch mode, by approx. 2000% (at least on my FPGA setup). (Before: ca. 20 Traces/s, Now: ca. 400 Traces/s)
First TVLA results look good: (first plot: masks off, 10k traces, second plot: masks on, 40k traces)
Once the corresponding PR for the serial device code (lowRISC/opentitan#17416) is merged I'll open another PR for the built binary.