staging: comedi: pcl730: add support for the PCL-734 ISA board

The PCL-734 ISA board can be supported by this driver. This board has
32 isolated digital outputs.

Add support for the PCL-734 board to the pcl730 driver and remove it
from the poc driver.

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