ARM: dts: imx: imx7d add iomuxc lpsr device node

Add device tree node to support iomuxc-lpsr controller, fsl,input-sel
phandle allows to get input select register base address which is
shared from main iomuxc controller.
Signed-off-by: NAdrian Alonso <aalonso@freescale.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d.dtsi

@@ -446,6 +446,12 @@
 				status = "disabled";
 			};
 
+			iomuxc_lpsr: iomuxc-lpsr@302c0000 {
+				compatible = "fsl,imx7d-iomuxc-lpsr";
+				reg = <0x302c0000 0x10000>;
+				fsl,input-sel = <&iomuxc>;
+			};
+
 			gpt1: gpt@302d0000 {
 				compatible = "fsl,imx7d-gpt", "fsl,imx6sx-gpt";
 				reg = <0x302d0000 0x10000>;