vfio/pci: Fixup PCI option ROMs

Devices like Intel graphics are known to not only have bad checksums,
but also the wrong device ID.  This is not so surprising given that
the video BIOS is typically part of the system firmware image rather
that embedded into the device and needs to support any IGD device
installed into the system.

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