systemc: Add a dummy argv[0] when running the tests.

systemc: Add a dummy argv[0] when running the tests.

One TLM test will complain if argc isn't 1 or 2, assuming that that
must mean that argc > 2. If it's 0 then the test will also complain and
fail. We therefore need to pass it at least a dummy value in argv/argc.

Change-Id: I5c64856f46d1459d7238e88ad8ba06933c7c38b8
Reviewed-on: https://gem5-review.googlesource.com/c/15065
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>