Sensor: VCNL4040: Update to lux/step constants

Right now, the driver uses the lux/step constants from the datasheet
https://www.vishay.com/docs/84307/designingvcnl4040.pdf
However, the newest datasheet from 2024
indicates that the lux/step have changed (page 12)
https://www.vishay.com/docs/84274/vcnl4040.pdf



Signed-off-by: Emilio Aguila Escalante <emilio.aguila@hotmail.com>