regulator: bd718x7: Constify pointers to 'regulator_desc' wrap struct

Pointer to 'struct regulator_desc' is a pointer to const and the
wrapping structure (container) is not being modified, thus entire syntax
can be replaced to preferred and safer container_of_const().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20251126-container-of-const-regulator-v1-4-eeec378144d4@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: krzk

drivers/regulator/bd718x7-regulator.c

@@ -698,9 +698,9 @@ static int buck_set_hw_dvs_levels(struct device_node *np,
 			    const struct regulator_desc *desc,
 			    struct regulator_config *cfg)
 {
-	struct bd718xx_regulator_data *data;
+	const struct bd718xx_regulator_data *data;
 
-	data = container_of(desc, struct bd718xx_regulator_data, desc);
+	data = container_of_const(desc, struct bd718xx_regulator_data, desc);
 
 	return rohm_regulator_set_dvs_levels(&data->dvs, np, desc, cfg->regmap);
 }