heathrow: change heathrow_pic_init() to return the heathrow device
This enables the device to be made available during the setup of the Old World machine. In order to pass back the previous set of IRQs we temporarily introduce a new pic_irqs parameter until it can be removed. An additional benefit of this change is that it is also possible to remove the pic_mem pointer used for macio by accessing the memory region via sysbus. Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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