powerpc/irq: Stop exporting irq_map

First step in eliminating irq_map[] table entirely

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/sysdev/xics/xics-common.c b/arch/powerpc/sysdev/xics/xics-common.c
index c58844d..a0576b7 100644
--- a/arch/powerpc/sysdev/xics/xics-common.c
+++ b/arch/powerpc/sysdev/xics/xics-common.c
@@ -240,9 +240,9 @@
 		/* We can't set affinity on ISA interrupts */
 		if (virq < NUM_ISA_INTERRUPTS)
 			continue;
-		if (irq_map[virq].host != xics_host)
+		if (virq_to_host(virq) != xics_host)
 			continue;
-		irq = (unsigned int)irq_map[virq].hwirq;
+		irq = (unsigned int)virq_to_hw(virq);
 		/* We need to get IPIs still. */
 		if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
 			continue;