Staging: comedi: comedi_pci.h: remove unneeded wrapper

just call pci_disable_device() directly in comedi_pci_enable()
as no wrapper is needed now that we are in the kernel tree.

Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>