staging: comedi: ni_pcmdio: include new "comedi_pci.h" header

Include the new "../comedi_pci.h" header instead of "../comedidev.h",
which will now get included indirectly.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>