arm64: dts: rk3399: Remove extcon unit address and extcon-cells from Gru

The cros-ec-extcon has no reg property so remove the unit address from
the DT node to make DT compiler happy.

While here, remove the inexistent extcon-cells property from the extcon
nodes.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20200207141324.3188898-1-enric.balletbo@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-gru-chromebook.dtsi

@@ -291,11 +291,9 @@ ap_i2c_tp: &i2c5 {
 		#pwm-cells = <1>;
 	};
 
-	usbc_extcon1: extcon@1 {
+	usbc_extcon1: extcon1 {
 		compatible = "google,extcon-usbc-cros-ec";
 		google,usb-port-id = <1>;
-
-		#extcon-cells = <0>;
 	};
 };
 

arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi

@@ -570,11 +570,9 @@ ap_i2c_audio: &i2c8 {
 			#size-cells = <0>;
 		};
 
-		usbc_extcon0: extcon@0 {
+		usbc_extcon0: extcon0 {
 			compatible = "google,extcon-usbc-cros-ec";
 			google,usb-port-id = <0>;
-
-			#extcon-cells = <0>;
 		};
 	};
 };