staging: comedi: rtd520: cleanup the boardinfo

Remove a couple unnecessary comments. For aesthetic reasons, add
some whitespace to the boardinfo to improve readability.

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>