staging: comedi: ni_mio_common: remove DEBUG_INTERRUPT messages

Defining DEBUG_INTERRUPT enables some function trace messages  during the
interrupt. 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>