ARM: dts: imx27 iomux device node

This patch adds a iomux node for imx27 pinctrl driver. The gpio
registers are embedded in the iomux memory area. So this patch moves
them into the iomux node for a better hardware description.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx27.dtsi

@@ -236,6 +236,13 @@ sdhci2: sdhci@10014000 {
 				status = "disabled";
 			};
 
+			iomuxc: iomuxc@10015000 {
+				compatible = "fsl,imx27-iomuxc";
+				reg = <0x10015000 0x600>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges;
+
 				gpio1: gpio@10015000 {
 					compatible = "fsl,imx27-gpio", "fsl,imx21-gpio";
 					reg = <0x10015000 0x100>;
@@ -295,6 +302,7 @@ gpio6: gpio@10015500 {
 					interrupt-controller;
 					#interrupt-cells = <2>;
 				};
+			};
 
 			audmux: audmux@10016000 {
 				compatible = "fsl,imx27-audmux", "fsl,imx21-audmux";