rvfi_trap not correct for single step instructions

Created by: silabs-oysteink

Bug Title

Component

Component:RTL: RVFI

Steps to Reproduce

The steps provided in issue #340 (closed) can be used for this issue as well. Any single stepped instruction in the test seems to exhibit this behavior:

The single step instruction reaches WB and generates a wb_valid, which leads to rvfi_valid with no bits set in rvfi_trap. rvfi_trap_next can be seen to have some bits set at the same time as rvfi_valid is high (marked in blue in the figure), but these does not seem to correspond to the user manual description of rvfi_trap.