[otbn dv] Include missing header file
[otbn dv] Include missing header file

Without this, OTBN and oddly, chip level sims fail with the following
error:

```console
scratch/rstmgr-test/top_earlgrey_asic-sim-vcs/default/sim-vcs/../src/lowrisc_ip_otbn_tracer_0/cpp/log_trace_listener.cc: In constructor 'LogTraceListener::LogTraceListener(const string&)':
scratch/rstmgr-test/top_earlgrey_asic-sim-vcs/default/sim-vcs/../src/lowrisc_ip_otbn_tracer_0/cpp/log_trace_listener.cc:18:11: error: 'runtime_error' is not a member of 'std'
     throw std::runtime_error(oss.str());
```

Signed-off-by: Srikrishna Iyer <2803d640feace36379942447842f26c7747b4dc3@google.com>

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