Sensirion SHT3x Humidity and Temperature Sensor

Required node properties:
- compatible: "sensirion,sht3x" or "sensirion,sts3x"
- reg: I2C bus address of the device

Optional properties:
- sensirion,blocking-io: enable blocking mode on i2c
- sensirion,no-high-precision: disable high accuracy

Example sht3x node:

sensor {
	compatible = "sensirion,sht3x";
	reg = <0x4a>;
}