ARM: pxa: arbitrarily set first interrupt number

As IRQ0, the legacy timer interrupt  should not be used as an interrupt
number, shift the interrupts by a fixed number.

As we had in a special case a shift of 16 when ISA bus was used on a
PXA, use that value as the first interrupt number, regardless of ISA or
not.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

arch/arm/mach-pxa/include/mach/irqs.h

@@ -12,14 +12,9 @@
 #ifndef __ASM_MACH_IRQS_H
 #define __ASM_MACH_IRQS_H
 
-#ifdef CONFIG_PXA_HAVE_ISA_IRQS
-#define PXA_ISA_IRQ(x)	(x)
-#define PXA_ISA_IRQ_NUM	(16)
-#else
-#define PXA_ISA_IRQ_NUM	(0)
-#endif
+#include <asm/irq.h>
 
-#define PXA_IRQ(x)	(PXA_ISA_IRQ_NUM + (x))
+#define PXA_IRQ(x)	(NR_IRQS_LEGACY + (x))
 
 #define IRQ_SSP3	PXA_IRQ(0)	/* SSP3 service request */
 #define IRQ_MSL		PXA_IRQ(1)	/* MSL Interface interrupt */