drivers/vfio: Enable VFIO if EEH is not supported

The existing vfio_pci_open() fails upon error returned from
vfio_spapr_pci_eeh_open(), which breaks POWER7's P5IOC2 PHB
support which this patch brings back.

The patch fixes the issue by dropping the return value of
vfio_spapr_pci_eeh_open().

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --cc drivers/vfio/pci/vfio_pci.c
Simple merge

diff --cc drivers/vfio/vfio_spapr_eeh.c
Simple merge

diff --cc include/linux/vfio.h
Simple merge