K70 Vengeance sends garbage keypresses when changing  backlight brightness.
This hooks to the existing corsair driver, which filters out those
invalid keypresses on similar devices in the input mapping code.

V2: Fix spelling.
Signed-off-by: Aaron Bottegal <aaronbottegal@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>