staging: comedi: amplc_pci224: use attach_pci() hook

Change the amplc_pci224 driver to use the new attach_pci() hook in
struct comedi_driver to auto-configure probed PCI devices.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>