spapr: introduce a spapr_irq_set_lsi() helper
It will make synchronisation easier with the XIVE interrupt mode when available. The 'irq' parameter refers to the global IRQ number space. 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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