staging/comedi: remove German in-file changelog

My script that finds typos always wants to do s/Funktion/Function/.
Instead of adding some whilelist logic to my script just delete the
changelog that is useless in general and still more in this case as most
kernel developers don't understand it.

Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>