overlays: i2c-sensor: Add sts3x support

Add a parameter to the i2c-sensor overlay to support the STS3X sensors
from Sensirion.

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

Author: pelwell

arch/arm/boot/dts/overlays/README

@@ -2444,7 +2444,8 @@ Params: addr                    Set the address for the AD799X, ADS7828,
                                 BME280, BME680, BMP280, BMP380, BMP58x, CCS811,
                                 DS1621, HDC100X, HDC3020, JC42, LM75, MCP980x,
                                 MPU6050, MPU9250, MS5637, MS5803, MS5805,
-                                MS5837, MS8607, SHT3x, TMP102 or VEML6030.
+                                MS5837, MS8607, SHT3x, STS3X, TMP102 or
+                                VEML6030.
 
         i2c-bus                 Supports all the standard I2C bus selection
                                 parameters - see "dtoverlay -h i2c-bus"
@@ -2640,6 +2641,8 @@ Params: addr                    Set the address for the AD799X, ADS7828,
         sps30                   Select the Sensirion SPS30 particulate matter
                                 sensor. Fixed address 0x69.
 
+        sts3x                   Select the Sensirion STS3X temperature sensors.
+                                Valid addresses 0x4a-0x4b, default 0x4a
 
         tcs3472                 Select the AMS TAOS TCS3472 family of RGBW light
                                 sensors.

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

@@ -878,6 +878,21 @@
 		};
 	};
 
+	fragment@57 {
+		target = <&i2cbus>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			sts3x: sts3x@4a {
+				compatible = "sensirion,sts3x";
+				reg = <0x4a>;
+				status = "okay";
+			};
+		};
+	};
+
 	fragment@98 {
 		target-path = "/";
 		__dormant__ {
@@ -967,6 +982,7 @@
 		ad7997 = <0>,"+56", <&ad799x>,"compatible=adi,ad7997";
 		ad7998 = <0>,"+56", <&ad799x>,"compatible=adi,ad7998";
 		ad7999 = <0>,"+56", <&ad799x>,"compatible=adi,ad7999", <&ad799x>,"reg:0=0x29";
+		sts3x = <0>,"+57";
 
 		addr =	<&bme280>,"reg:0", <&bmp280>,"reg:0", <&tmp102>,"reg:0",
 			<&lm75>,"reg:0", <&hdc100x>,"reg:0", <&sht3x>,"reg:0",
@@ -982,7 +998,7 @@
 			<&ads7828>,"reg:0", <&ads7830>,"reg:0",
 			<&adxl355>,"reg:0", <&bmp58x>,"reg:0",
 			<&veml6030>,"reg:0", <&tmp117>,"reg:0",
-			<&ad799x>,"reg:0";
+			<&ad799x>,"reg:0", <&sts3x>,"reg:0";
 		int_pin = <&int_pins>, "brcm,pins:0",
 			<&int_pins>, "reg:0",
 			<&max30102>, "interrupts:0",