mxc: turn to soc specific init_irq functions

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx3/mx31ads.c b/arch/arm/mach-mx3/mx31ads.c
index 30e2767..0497c15 100644
--- a/arch/arm/mach-mx3/mx31ads.c
+++ b/arch/arm/mach-mx3/mx31ads.c
@@ -517,7 +517,7 @@
 
 static void __init mx31ads_init_irq(void)
 {
-	mxc_init_irq();
+	mx31_init_irq();
 	mx31ads_init_expio();
 }