arm64: dts: enable the MUSB controller of Pine64 in host-only mode

A64 has a MUSB controller wired to the USB PHY 0, which is connected
to the upper USB Type-A port of Pine64.

As the port is a Type-A female port, enable it in host-only mode in the
device tree, which makes devices with USB Type-A male port can work on
this port (which is originally designed by Pine64 team).
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts

@@ -81,6 +81,11 @@ &uart0 {
 	status = "okay";
 };
 
+&usb_otg {
+	dr_mode = "host";
+	status = "okay";
+};
+
 &usbphy {
 	status = "okay";
 };