configs,gpu-compute: Add render driver needed for ROCm 4

ROCm 4 utilizes the render driver located at /dev/dri/renderDXXX. This
patch implements a very simple driver that just returns a file
descriptor when opened, as testing has shown that's all that's needed

Change-Id: I65602346cbf17b2dc80e114046ebf5c9830a1507
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46244
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
6 files changed