Staging: comedi: fix up build error from last Kconfig changes

We need the 8255 module to be present for some PCI comedi
modules.  So for now, just build the thing.  We need some better
Kconfig rules to figure this out properly.

Cc: Alexander Kurz <linux@blala.de>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>