power: supply: twl4030_madc_battery: Refactor twl4030_madc_bat_ext_changed()

twl4030_madc_bat_ext_changed() is a wrapper around
"power_supply_changed(psy);" and it has the same prototype.

Remove it, replacing it with making the external_power_changed
callback directly point to power_supply_changed.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/twl4030_madc_battery.c

@@ -168,19 +168,13 @@ static int twl4030_madc_bat_get_property(struct power_supply *psy,
 	return 0;
 }
 
-static void twl4030_madc_bat_ext_changed(struct power_supply *psy)
-{
-	power_supply_changed(psy);
-}
-
 static const struct power_supply_desc twl4030_madc_bat_desc = {
 	.name			= "twl4030_battery",
 	.type			= POWER_SUPPLY_TYPE_BATTERY,
 	.properties		= twl4030_madc_bat_props,
 	.num_properties		= ARRAY_SIZE(twl4030_madc_bat_props),
 	.get_property		= twl4030_madc_bat_get_property,
-	.external_power_changed	= twl4030_madc_bat_ext_changed,
-
+	.external_power_changed	= power_supply_changed,
 };
 
 static int twl4030_cmp(const void *a, const void *b)