ARM: DTS: Add iomux node to vf.dtsi for Vybrid devices

This node is in sync with v4.20-next tree:
e4dda4f5a4df "x86/kaslr, ACPI/NUMA: avoid including asm/kaslr.h on arm64"

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/arch/arm/dts/vf.dtsi b/arch/arm/dts/vf.dtsi
index 5198eee..ad30059 100644
--- a/arch/arm/dts/vf.dtsi
+++ b/arch/arm/dts/vf.dtsi
@@ -89,6 +89,12 @@
 				status = "disabled";
 			};
 
+			iomuxc: iomuxc@40048000 {
+				compatible = "fsl,vf610-iomuxc";
+				reg = <0x40048000 0x1000>;
+				fsl,mux_mask = <0x700000>;
+			};
+
 			gpio0: gpio@40049000 {
 				compatible = "fsl,vf610-gpio";
 				reg = <0x400ff000 0x40>;