iio: humidity: Add driver for ti HDC302x humidity sensors

Add support for HDC302x integrated capacitive based relative
humidity (RH) and temperature sensor.
This driver supports reading values, reading the maximum and
minimum of values and controlling the integrated heater of
the sensor.

Co-developed-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Li peiyu <579lpy@gmail.com>
Link: https://lore.kernel.org/r/20231211122940.9791-1-579lpy@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>