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If there is no GPU present, skip creation of the GPU-related debugfs
files, making the MSM's debugfs more usable.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561742/

Signed-off-by: Rob Clark <robdclark@chromium.org>