staging: comedi: rti800: remove the 'fingerprint' debug printk

Remove the debug noise that outputs the board 'fingerprint' during
the attach.

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>