ARM: dts: mmp3-dell-ariel: Enable the HSIC

There's a SMSC USB2640 (USB hub & SD controller) connected to it, but
the SD card slot footprint is unpopulated. Also connected to the hub is
a SMSC LAN7500 gigabit ethernet adapter.

Link: https://lore.kernel.org/r/20191220065314.237624-6-lkundrak@v3.skSigned-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/boot/dts/mmp3-dell-ariel.dts

@@ -49,6 +49,28 @@ &usb_otg_phy0 {
 	status = "okay";
 };
 
+&hsic0 {
+	status = "okay";
+
+	usb1@1 {
+		compatible = "usb424,2640";
+		reg = <0x01>;
+		#address-cells = <0x01>;
+		#size-cells = <0x00>;
+
+		mass-storage@1 {
+			compatible = "usb424,4040";
+			reg = <0x01>;
+			status = "disabled";
+		};
+	};
+};
+
+&hsic_phy0 {
+	status = "okay";
+	reset-gpios = <&gpio 63 GPIO_ACTIVE_HIGH>;
+};
+
 &mmc3 {
 	status = "okay";
 	max-frequency = <50000000>;