systemc: Tell verify.py to expect two tests to fail.

These tests purposefully fail when they run, so a return code of 1
should be considered successful.

Change-Id: Ia4ef0469ed946d26a767805ca2d0acd734f1aec9
Reviewed-on: https://gem5-review.googlesource.com/c/12448
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>