staging: comedi: gsc_hpdi: remove DEBUG_PRINT

The DEBUG_PRINT macro in this driver is used to output development
debug tracing messages. These messages are just added noise. Remove
them.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>