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The MOS6522 VIA forms the bridge part of several Mac devices, including the Mac via-cuda and via-pmu devices. Introduce a standard mos6522 device that can be shared amongst multiple implementations. This is effectively taking the 6522 parts out of cuda.c and turning them into a separate device whilst also applying some style tidy-ups and including a conversion to trace-events. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>