iio: light: veml3235: fix scale to conform to ABI

iio: light: veml3235: fix scale to conform to ABI

The current scale is not ABI-compliant as it is just the sensor gain
instead of the value that acts as a multiplier to be applied to the raw
value (there is no offset).

Use the iio-gts helpers to obtain the proper scale values according to
the gain and integration time to match the resolution tables from the
datasheet. When at it, use 'scale' instead of 'gain' consistently for
the get/set functions to avoid misunderstandings.

Fixes: c5a23f80c164 ("iio: light: add support for veml3235")
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241230-veml3235_scale-v3-2-48a5795e2f64@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>