ARM: 7342/2: sa1100: prepare for sparse irq conversion

In preparation to convert SA1100 to sparse irq, set .nr_irqs for each machine
and explicitly include mach/irqs.h as needed.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-sa1100/irq.c b/arch/arm/mach-sa1100/irq.c
index 5d12a30..516ccc2 100644
--- a/arch/arm/mach-sa1100/irq.c
+++ b/arch/arm/mach-sa1100/irq.c
@@ -17,6 +17,7 @@
 #include <linux/syscore_ops.h>
 
 #include <mach/hardware.h>
+#include <mach/irqs.h>
 #include <asm/mach/irq.h>
 
 #include "generic.h"