ARM: orion: use SPARSE_IRQ everywhere

As a preparation for multiplatform support, this moves all the
code using plat-orion over to use sparse irq support, which is
enabled implicitly for multiplatform.

In particular, the hardcoded NR_IRQS macro gets replaced with
a machine specific one that is set in the machine descriptor
in order to set up a static mapping for all legacy interrupts.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
diff --git a/arch/arm/mach-mv78xx0/include/mach/irqs.h b/arch/arm/mach-mv78xx0/include/mach/irqs.h
index fa1d422..ac96bcf 100644
--- a/arch/arm/mach-mv78xx0/include/mach/irqs.h
+++ b/arch/arm/mach-mv78xx0/include/mach/irqs.h
@@ -88,7 +88,7 @@
 #define IRQ_MV78XX0_GPIO_START	96
 #define NR_GPIO_IRQS		32
 
-#define NR_IRQS			(IRQ_MV78XX0_GPIO_START + NR_GPIO_IRQS)
+#define MV78XX0_NR_IRQS		(IRQ_MV78XX0_GPIO_START + NR_GPIO_IRQS)
 
 
 #endif