overlays: Fix dtc warnings in i2c-gpio

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

Better late than never.
Signed-off-by: NPhil Elwell <phil@raspberrypi.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts

@@ -11,6 +11,9 @@
 		target-path = "/";
 
 		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
 			i2c_gpio: i2c@0 {
 				reg = <0xffffffff>;
 				compatible = "i2c-gpio";