Fix for issue #497

Created by: silabs-oysteink

CLIC pointers will now set wb_valid. RVFI will not set rvfi_valid for CLIC pointers.

Not SEC clean: 1: A performance counter event raises when wb_valid == 0. 2: Single step entry when pointer fetch fails did not happen before (bug). - Now single step is entered once the faulted pointer reaches WB (dpc == first instruction of exception handler).

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