staging: comedi: usbduxfast: remove COMEDI_DEBUG noise in usb (*probe)

The COMEDI_DEBUG noise in the usb (*probe) is just added function
trace noise. Remove it along with the final dev_info().

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>