ARM: at91: sparse irq support

Enable sparse irq support for multisoc image. It involves to add the
NR_IRQS_LEGACY offset to static SoC irq number definitions since NR_IRQS_LEGACY
irq descs are allocated before AIC requests irq descs allocation.
Move NR_AIC_IRQS macro to a more appropiate place with the purpose to
remove mach/irqs.h later.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/mach-at91/include/mach/at91_aic.h b/arch/arm/mach-at91/include/mach/at91_aic.h
index 7867378..fd42a85 100644
--- a/arch/arm/mach-at91/include/mach/at91_aic.h
+++ b/arch/arm/mach-at91/include/mach/at91_aic.h
@@ -28,6 +28,9 @@
 .extern at91_aic_base
 #endif
 
+/* Number of irq lines managed by AIC */
+#define NR_AIC_IRQS	32
+
 #define AT91_AIC_IRQ_MIN_PRIORITY	0
 #define AT91_AIC_IRQ_MAX_PRIORITY	7