drm/panfrost: Add an helper to check the GPU generation
All models with an ID >= 0x1000 are Bifrost GPUs for now (might change with new gens). Suggested-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190618081648.17297-4-boris.brezillon@collabora.com
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