dt-bindings: iio: chemical: add ENS160 sensor

Add bindings for ScioSense ENS160 multi-gas sensor.

Datasheet: https://www.sciosense.com/wp-content/uploads/2023/12/ENS160-Datasheet.pdf


Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Gustavo Silva <gustavograzs@gmail.com>
Link: https://lore.kernel.org/r/20240604225747.7212-3-gustavograzs@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>