iio: adc: qcom-vadc: make scale_adc5_fn const

Add const qualifier to struct qcom_adc5_scale_type scale_adc5_fn[]. 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-9-v1-1-188ca6e904ee@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dlech

drivers/iio/adc/qcom-vadc-common.c

@@ -330,7 +330,7 @@ static int qcom_vadc7_scale_hw_calib_die_temp(
 				const struct adc5_data *data,
 				u16 adc_code, int *result_mdec);
 
-static struct qcom_adc5_scale_type scale_adc5_fn[] = {
+static const struct qcom_adc5_scale_type scale_adc5_fn[] = {
 	[SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt},
 	[SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm},
 	[SCALE_HW_CALIB_XOTHERM] = {qcom_vadc_scale_hw_calib_therm},