Add support for Toshiba Illumination. This is a set of LEDs installed on
some Toshiba laptops. It is controlled through ACPI, the commands has been
found through reverse engineering. It has been tested on a Toshiba Qosmio
G50-122.
Signed-off-by: NPierre Ducroquet <pinaraf@pinaraf.info>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>