staging: comedi: s626: remove boardinfo

This driver only supports one board type. Move the used board info
out of the boardinfo struct and remove it.

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>