[otbn,dv] Check expected end address in otbn_top_sim
[otbn,dv] Check expected end address in otbn_top_sim

This teaches simulations using otbn_top_sim to check the end address
at the end of the simulation.

Signed-off-by: Rupert Swarbrick <290093e2ad2515ed2f14d749293c8cf8e02ca274@lowrisc.org>

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