dma: eliminate DMAContext
The DMAContext is a simple pointer to an AddressSpace that is now always already available. Make everyone hold the address space directly, and clean up the DMA API to use the AddressSpace directly. Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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