tests,gpu-compute,mem-ruby: Add GPU Ruby random test

This adds the GPU protocol random tester to the quick/Kokoro tests. The
input has been sized to take around 20 seconds and provides good
coverage for the coherence protocol.

This test can be run with the following:

```
cd tests
./main.py run -j`nproc` gem5/gpu
```

Change-Id: I08d199f0de8cca985f992b7f39b5f82e4218c82d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58270
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
1 file changed