staging: comedi: addi_apci_2200: remove unnecessary boardinfo

The boardinfo is not longer needed by this driver. Remove it
as well as the addi_find_boardinfo() function.

This removes the final ties to the addi-data "common" code so
remove the #include for it.

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>