iio: light: isl76682: make isl76682_range_table const

Add const qualifier to struct isl76682_range isl76682_range_table[].
This is read-only data so it can be made const.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250628-iio-const-data-21-v1-1-2597d8eda30f@baylibre.com


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