arm64: dts: colibri-imx8x: Add fxl6408 gpio expander

Add fxl6408 gpio expander, this is required for Wi-Fi, Bluetooth and USB
functionalities.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi

@@ -108,6 +108,21 @@
 		adi,conversion-interval = /bits/ 8 <255>;
 		status = "disabled";
 	};
+
+	gpio_expander_43: gpio@43 {
+		compatible = "fcs,fxl6408";
+		reg = <0x43>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "Wi-Fi_W_DISABLE",
+				  "Wi-Fi_WKUP_WLAN",
+				  "PWR_EN_+V3.3_WiFi_N",
+				  "PCIe_REF_CLK_EN",
+				  "USB_RESET_N",
+				  "USB_BYPASS_N",
+				  "Wi-Fi_PDn",
+				  "Wi-Fi_WKUP_BT";
+	};
 };
 
 /* TODO i2c lvds0 accessible on FFC (X2) */