iio: light: cm32181: Add support for ACPI enumeration

Add support for ACPI enumeration, this has been tested on a HP
HP Pavilion x2 Detachable 10 (Bay Trail model).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>