bus error test fixes and incorporate multi-bit traps
Created by: strichmo
The new RVFI multi-bit trap (as described in the E40X User Manual) is now integrated into the testbench.
The 4 random bus error tests are now mostly passing.
The OBI scoreboard is broken for some tests, but those will be described in an issue to be fixed by @silabs-robin
later.
Advance the RTL hash to the latest E40X master.