mxc: turn to soc specific init_irq functions

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx2/generic.c b/arch/arm/mach-mx2/generic.c
index bdc5a6e..ae8f759 100644
--- a/arch/arm/mach-mx2/generic.c
+++ b/arch/arm/mach-mx2/generic.c
@@ -85,3 +85,13 @@
 	iotable_init(mxc_io_desc, ARRAY_SIZE(mxc_io_desc));
 }
 
+void __init mx27_init_irq(void)
+{
+	mxc_init_irq(IO_ADDRESS(AVIC_BASE_ADDR));
+}
+
+void __init mx21_init_irq(void)
+{
+	mx27_init_irq();
+}
+