Hooked up mnxti to RVFI.

Created by: silabs-oysteink

mnxti_rdata will now reflect what is visible to SW as read data and is written to GPR (pointer address or 0). mnxti_n is a mirror of mstatus_n.

SEC clean

Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com