spapr: introduce a spapr_irq_init() routine
Initialize the MSI bitmap from it as this will be necessary for the sPAPR IRQ backend for XIVE. Signed-off-by: NCédric Le Goater <clg@kaod.org> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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