ARM: picoxcell: don't reserve irq_descs

All irq_desc's are now dynamically allocated so we don't need to
statically reserve them.

v2:	- select SPARSE_IRQ and set .nr_irqs to NR_IRQS_LEGACY to skip
	ISA and IRQ 0.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
diff --git a/arch/arm/mach-picoxcell/common.c b/arch/arm/mach-picoxcell/common.c
index ad871bd..d34b333 100644
--- a/arch/arm/mach-picoxcell/common.c
+++ b/arch/arm/mach-picoxcell/common.c
@@ -45,7 +45,7 @@
 
 DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
 	.map_io		= picoxcell_map_io,
-	.nr_irqs	= ARCH_NR_IRQS,
+	.nr_irqs	= NR_IRQS_LEGACY,
 	.init_irq	= picoxcell_init_irq,
 	.handle_irq	= vic_handle_irq,
 	.timer		= &picoxcell_timer,