gpu: host1x: Set DMA direction only for DMA-mapped buffer objects
The DMA direction is only used by the DMA API, so there is no use in setting it when a buffer object isn't mapped with the DMA API. Signed-off-by: Thierry Reding <treding@nvidia.com> Tested-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
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