staging: comedi: me4000: convert boardinfo initialization to C99 format

Convert the boardinfo initialization to C99 format to make it
less error prone and easier to maintain.

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>