staging: comedi: addi_apci_3200: remove driver

This driver has some serious bitrot. In addition, it's not in the Kconfig
or Makefile so it can't even be built.

Just remove it. It would be easier to rewrite the driver than fix 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>