[dvsim] Deal with non unicode chars in log files
[dvsim] Deal with non unicode chars in log files

- get_status() reads the log file to look for errors. If non-unicode
chars are encountered, it barfs up completely. This should fix that.

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

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan