[otbn] Simplify verbose tracing in otbnsim Rather than keeping a verbose property on OTBNModel, we move it to an argument on the simulator step and run functions. Once we've done this, we can also avoid having to create the model explicitly in the scripts. This also means we can cleanly print disassembly in the stepped model (which was the main motivation!) Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
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