dgnc: Make all lines under 80 characters in dgnc_cls.h

Some of the lines are over 80 characters so fix that by moving the
comments before the struct definition and before #define's.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>