power: supply: sysfs: use power_supply_property_is_writeable()

Instead of open-coding the helper use it directly.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240608-power-supply-extensions-v2-1-2dcd35b012ad@weissschuh.netSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/power_supply_sysfs.c

@@ -379,8 +379,7 @@ static umode_t power_supply_attr_is_visible(struct kobject *kobj,
 		int property = psy->desc->properties[i];
 
 		if (property == attrno) {
-			if (psy->desc->property_is_writeable &&
-			    psy->desc->property_is_writeable(psy, property) > 0)
+			if (power_supply_property_is_writeable(psy, property) > 0)
 				mode |= S_IWUSR;
 
 			return mode;