18.3: passing invalid arguments to the meson generated test

In master branch the pl111 driver got renamed to kmsro but not in 18.3. Yet the generated tests use kmsro. Causing a failure like the following:

https://mesa-ci.01.org/wip_18_3/builds/23/results/1534585

Mildly related: where's the code that generates those, can we have a link to that from the failing tests?