extcon: axp288: Fix wakeup source leaks on device unbind

Device can be unbound, so driver must also release memory for the wakeup
source.

Link: https://lore.kernel.org/lkml/[e-mail]/
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-axp288.c

···
 	if (ret < 0)
 		return ret;
 
-	device_init_wakeup(dev, true);
+	devm_device_init_wakeup(dev);
 	platform_set_drvdata(pdev, info);
 
 	return 0;