staging: comedi: das16: remove DEBUG_PRINT macro

This macro outputs some printk() debug info that is just added noise.
Remove it as well as the DEBUG stuff.

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>