ARM: dts: am335x-nano: Enable USB host

Add missing entry to enable the USB host.
Signed-off-by: Mark Jackson <mpfj@newflow.co.uk>
Message-Id: <20221130140547.295859-6-mpfj@newflow.co.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-nano.dts

@@ -423,6 +423,10 @@ &mmc1 {
 	wp-gpios = <&gpio3 18 GPIO_ACTIVE_HIGH>;
 };
 
+&usb0 {
+	dr_mode = "host";
+};
+
 #include "tps65217.dtsi"
 
 &tps {