ARM: at91: at91sam9n12: move external irq declatation to DT

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9n12.dtsi

@@ -57,6 +57,7 @@ aic: interrupt-controller@fffff000 {
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
 				reg = <0xfffff000 0x200>;
+				atmel,external-irqs = <31>;
 			};
 
 			ramc0: ramc@ffffe800 {

arch/arm/mach-at91/at91sam9n12.c

@@ -223,13 +223,7 @@ static void __init at91sam9n12_map_io(void)
 	at91_init_sram(0, AT91SAM9N12_SRAM_BASE, AT91SAM9N12_SRAM_SIZE);
 }
 
-void __init at91sam9n12_initialize(void)
-{
-	at91_extern_irq = (1 << AT91SAM9N12_ID_IRQ0);
-}
-
 AT91_SOC_START(at91sam9n12)
 	.map_io = at91sam9n12_map_io,
 	.register_clocks = at91sam9n12_register_clocks,
-	.init = at91sam9n12_initialize,
 AT91_SOC_END