staging: comedi: cb_pcimdas: remove BADR2 from the private data

The pci resource bar 2 address is the primary i/o address used
by this device. Store it in dev->iobase 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>