staging: comedi: adv_pci1723: remove function trace messages

Remove the DPRINTK function trace messages. These should not be
in the final driver.

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>