Add 'override_only' field to struct pci_device_id to be used as part of
pci_match_device().

When set, a driver only matches the entry when dev->driver_override is
set to that driver.

In addition, add a helper macro named 'PCI_DEVICE_DRIVER_OVERRIDE' to
enable setting some data on it.

Next patch from this series will use the above functionality.
Signed-off-by: NMax Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
Acked-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NYishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20210826103912.128972-10-yishaih@nvidia.comSigned-off-by: NAlex Williamson <alex.williamson@redhat.com>