regulator: bd71815: 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 <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/bd71815-regulator.c

···
 			     const struct regulator_desc *desc,
 			     struct regulator_config *cfg)
 {
-	struct bd71815_regulator *data;
+	const struct bd71815_regulator *data;
 
-	data = container_of(desc, struct bd71815_regulator, desc);
+	data = container_of_const(desc, struct bd71815_regulator, desc);
 	return rohm_regulator_set_dvs_levels(data->dvs, np, desc, cfg->regmap);
 }
 
···
 				    const struct regulator_desc *desc,
 				    struct regulator_config *cfg)
 {
-	struct bd71815_regulator *data;
+	const struct bd71815_regulator *data;
 	int ret = 0, val;
 
-	data = container_of(desc, struct bd71815_regulator, desc);
+	data = container_of_const(desc, struct bd71815_regulator, desc);
 
 	if (of_property_present(np, "rohm,dvs-run-voltage") ||
 	    of_property_present(np, "rohm,dvs-suspend-voltage") ||