iio: proximity: vcnl3020: make vcnl3020_property const

Add const qualifier to struct vcnl3020_property
vcnl3020_led_current_property. 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-25-v1-2-5d99cf17790e@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dlech

drivers/iio/proximity/vcnl3020.c

@@ -102,14 +102,14 @@ static u32 microamp_to_reg(u32 *val)
 	return *val /= 10000;
 };
 
-static struct vcnl3020_property vcnl3020_led_current_property = {
+static const struct vcnl3020_property vcnl3020_led_current_property = {
 	.name = "vishay,led-current-microamp",
 	.reg = VCNL_LED_CURRENT,
 	.conversion_func = microamp_to_reg,
 };
 
 static int vcnl3020_get_and_apply_property(struct vcnl3020_data *data,
-					   struct vcnl3020_property *prop)
+					   const struct vcnl3020_property *prop)
 {
 	int rc;
 	u32 val;