staging: comedi: TODO: remove item "reserve major number"

The major number for comedi has been listed in Documentation/devices.txt
since kernel 2.1.88.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>