staging: comedi: skel: use module_comedi_pci_driver()

Use the `module_comedi_pci_driver()` macro to register the module as a
comedi PCI driver instead of adding the boiler-plate code in full.

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