apb: QOMify IOMMU
This is in preparation to split the IOMMU device out of the APB. As part of this commit we also enforce separation of the IOMMU and APB devices by using a QOM object link to pass the IOMMU reference and accessing the IOMMU registers via a separate memory region mapped into the APB config space rather than directly. Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Acked-by: NArtyom Tarasenko <atar4qemu@gmail.com>
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