ARM: mxs: adopt irq_domain support for icoll driver

Remove irq_domain_add_legacy call from mach-mxs.c and have icoll adopt
irq_domain support in the driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 183fc65..99f7d7a 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -50,7 +50,7 @@
 			ranges;
 
 			icoll: interrupt-controller@80000000 {
-				compatible = "fsl,imx28-icoll", "fsl,mxs-icoll";
+				compatible = "fsl,imx28-icoll", "fsl,icoll";
 				interrupt-controller;
 				#interrupt-cells = <1>;
 				reg = <0x80000000 0x2000>;