drm: Fix mismerge of non-coherent DMA patch
The patch for supporting non coherent PCI DMA in the DRM was mismerged causing the page protection to be updated for the wrong type of mapping. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NDave Airlie <airlied@redhat.com>
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