staging: comedi: adv_pci1710: remove function trace messages

The macros PCI171X_EXTDEBUG and DPRINTK enable a number of function
trace messages. These trace messages should not be in the final
driver. Remove them.

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>