staging: comedi: dt2814: remove disabled irq probe code

The irq probe code in dt2814_attach() is disabled by an #if 0 block.
Just 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>