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>

Author: dlech

drivers/iio/light/isl76682.c

@@ -59,7 +59,7 @@ struct isl76682_range {
 	u32				ir;
 };
 
-static struct isl76682_range isl76682_range_table[] = {
+static const struct isl76682_range isl76682_range_table[] = {
 	{ ISL76682_COMMAND_RANGE_LUX_1K, 15000, 10500 },
 	{ ISL76682_COMMAND_RANGE_LUX_4K, 60000, 42000 },
 	{ ISL76682_COMMAND_RANGE_LUX_16K, 240000, 168000 },