staging: comedi: cb_pcimdas: remove BADR4 from the private data

The pci resource bar 4 address is only needed to initialize the
8255 subdevice. Use a local variable to hold it and remove it
from the private data.

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>