tests: Add a simple example test

Change-Id: I0753db61d6344b9ed95c0d90a1ab097de7e2af12
Signed-off-by: Sean Wilson <spwilson2@wisc.edu>
Reviewed-on: https://gem5-review.googlesource.com/4422
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
3 files changed