drm/radeon/kms: fix up gart setup on rs600
Set up rs600 gart like r600: - set gart system aperture to vram - inside gart system aperture is unmapped* - outside gart system aperture is mapped* *mapped refers to memory handled by page tables Signed-off-by: NAlex Deucher <alexdeucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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