Staging: comedi: cb_pcidas64: fix up build warnings

Now that the 8255.h file is being included properly, we were
using the incorrect function prototypes, which causes a build
warning now.  This fixes it up and preserves the __iomem markings that
sparse wants to see.

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