Enable fw_cfg DMA interface for ARM
Enable the fw_cfg DMA interface for the ARM virt machine. Based on Gerd Hoffman's initial implementation. Signed-off-by: NMarc Marí <markmb@redhat.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NLaszlo Ersek <lersek@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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