iio: light: add support for veml3235

The Vishay veml3235 is a low-power ambient light sensor with I2C
interface. It provides a minimum detectable intensity of
0.0021 lx/cnt, configurable integration time and gain, and an additional
white channel to distinguish between different light sources.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241023-veml3235-v3-2-8490f2622f9a@gmail.com


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