overlays: Add aht20 support to i2c-sensor

See: #6803

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Author: pelwell

arch/arm/boot/dts/overlays/README

@@ -2427,6 +2427,9 @@ Params: addr                    Set the address for the ADT7410, AS73211,
         aht10                   Select the Aosong AHT10 temperature and humidity
                                 sensor
 
+        aht20                   Select the Aosong AHT20 temperature and humidity
+                                sensor
+
         as73211                 Select the AMS AS73211 XYZ true color sensor
                                 Valid addresses 0x74-0x77, default 0x74
 

arch/arm/boot/dts/overlays/i2c-sensor-common.dtsi

@@ -666,6 +666,20 @@
 		};
 	};
 
+	fragment@43 {
+		target = <&i2cbus>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			aht20: aht20@38 {
+				compatible = "aosong,aht20";
+				reg = <0x38>;
+			};
+		};
+	};
+
 	fragment@99 {
 		target = <&gpio>;
 		__dormant__ {
@@ -721,6 +735,7 @@
 		as73211 = <0>,"+40+99";
 		as7331 = <0>,"+41+99";
 		adxl345 = <0>,"+42+99";
+		aht20 = <0>,"+43";
 
 		addr =	<&bme280>,"reg:0", <&bmp280>,"reg:0", <&tmp102>,"reg:0",
 			<&lm75>,"reg:0", <&hdc100x>,"reg:0", <&sht3x>,"reg:0",