Fix hard synchronization upon SOF start
If dominant bit starts in bus idle after sample point of third bit of intermission and DUT has pending transmission, DUT shall executed hard sync (because, from flow of time on bus, it is still in third bit of intermission).
But DUT PC FSM is already in s_pc_sof. This means that it reacts to resynchronisation.
This can be fixed that hard sync will be valid also during SOF, but this approach must be analyzed first.