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Implement a `CoherentView` type which is a view of `Coherent`. To be able to give out DMA handles, the view type contains both CPU and DMA pointers, and the projection method projects both at once. Delegate most of the `Io` implementation to `SysMemBackend`. Provide a method to erase the DMA handle and give out a `SysMem` view, if the user does not need the `dma_handle`. Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com> Link: https://patch.msgid.link/20260706-io_projection-v6-15-72cd5d055d54@garyguo.net Signed-off-by: Danilo Krummrich <dakr@kernel.org>