regulator: act8865-regulator: switch psy_cfg from of_node to fwnode

In order to remove .of_node from the power_supply_config struct,
use .fwnode instead.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/regulator/act8865-regulator.c

···
 	struct power_supply *charger;
 	struct power_supply_config cfg = {
 		.drv_data = regmap,
-		.of_node = dev->of_node,
+		.fwnode = dev_fwnode(dev),
 	};
 
 	charger = devm_power_supply_register(dev, &act8600_charger_desc, &cfg);