HID: wacom: Correct power_supply type

POWER_SUPPLY_TYPE_USB seems to only ever be used by USB ports that are
used to charge the machine itself (so a "system" scope), like the
single USB port on a phone, rather than devices.

The wacom_sys driver is the only driver that sets its device battery as
being a USB type, which doesn't seem correct based on its usage, so
switch it to be a battery type like all the other USB-connected devices.

Signed-off-by: Bastien Nocera <[email protected]>
Acked-by: Jason Gerecke <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
[[email protected]: Imported into input-wacom repository (6ff1cae2e30a)]
Signed-off-by: Joshua Dickens <[email protected]>

Author: hadess

4.5/wacom_sys.c

@@ -1833,7 +1833,7 @@ static int __wacom_initialize_battery(struct wacom *wacom,
 	bat_desc->get_property = wacom_battery_get_property;
 	sprintf(battery->bat_name, "wacom_battery_%ld", n);
 	bat_desc->name = battery->bat_name;
-	bat_desc->type = POWER_SUPPLY_TYPE_USB;
+	bat_desc->type = POWER_SUPPLY_TYPE_BATTERY;
 	bat_desc->use_for_apm = 0;
 
 	ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);