staging: comedi: amplc_dio200: don't select COMEDI_8255

The "amplc_dio200" module no longer depends on the "8255" module, so the
'COMEDI_AMPLC_DIO200' Kconfig setting no longer needs to select
'COMEDI_8255'.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>