ARM: dts: sun8i-a83t-tbs-a711: Drop superfluous dr_mode

Property dr_mode = "otg" is the default in sun8i-a83t.dtsi
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm/boot/dts/sun8i-a83t-tbs-a711.dts

@@ -493,7 +493,6 @@ gnss {
 };
 
 &usb_otg {
-	dr_mode = "otg";
 	status = "okay";
 };