arch/tile: use 0 for IRQ_RESCHEDULE instead of 1

This avoids assigning IRQ 0 to PCI devices, because we've seen that
doesn't always work well.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>

arch/tile/include/asm/irq.h

@@ -21,7 +21,7 @@
 #define NR_IRQS 32
 
 /* IRQ numbers used for linux IPIs. */
-#define IRQ_RESCHEDULE 1
+#define IRQ_RESCHEDULE 0
 
 #define irq_canonicalize(irq)   (irq)