Depending on IOMMU_DMA is suspicious, since the low-level DMA ops
internals and MSI helpers is provides are not of interest to general
drivers. In practice it mostly seems to be serving as a dependency on
ARM64 here, so do that properly. The venus driver looks like it won't
actually be useful at runtime without the IOMMU API, so add that too.
Signed-off-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Robert Foss <robert.foss@linaro.org> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>