staging: comedi: pcl730: add support for the ACL-7225b ISA board

The ACL-7225b and P16R16R-DIO ISA boards can be supported by this driver.
These board have 16 isolated digital outputs and 16 isolated digital
outputs.

Add support for these boards to the pcl730 driver and remove the
standalone acl7225b driver.

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