configs: Add construct for GPU dirs

Change-Id: I436f09d63a2ef63f1e139ffdeb29939587ef60b2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53073
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed