regulator: mtk-dvfsrc: Fix wrong dev pointer for devm_regulator_register

If use dev->parent, the regulator_unregister will not be called when this
driver is unloaded. Fix it by using dev instead.

Signed-off-by: Axel Lin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/mtk-dvfsrc-regulator.c

···
 	for (i = 0; i < regulator_init_data->size; i++) {
 		config.dev = dev->parent;
 		config.driver_data = (mt_regulators + i);
-		rdev = devm_regulator_register(dev->parent,
-					       &(mt_regulators + i)->desc,
+		rdev = devm_regulator_register(dev, &(mt_regulators + i)->desc,
 					       &config);
 		if (IS_ERR(rdev)) {
 			dev_err(dev, "failed to register %s\n",