staging: comedi: ni_pcidio: remove DEBUG_FLAGS define and code

The DEBUG_FLAGS define enables some development code that outputs
interrupt flags and status information in the interrupt handler.
This information is just added noise. Remove it.

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>