vfio/pci: Rename ops functions to fit core namings

This is another preparation patch for separating the vfio_pci driver to
a subsystem driver and a generic pci driver. This patch doesn't change
any logic.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20210826103912.128972-5-yishaih@nvidia.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>