dts: db410c: add alias for USB

Alias is required so req-seq will be filled.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>

arch/arm/dts/dragonboard410c.dts

@@ -18,6 +18,10 @@
 	#address-cells = <0x2>;
 	#size-cells = <0x2>;
 
+	aliases {
+		usb0 = "/soc/ehci@78d9000";
+	};
+
 	memory {
 		device_type = "memory";
 		reg = <0 0x80000000 0 0x3da00000>;