Now that struct pci_vpd is really small, simplify the code by embedding
struct pci_vpd directly in struct pci_dev instead of dynamically allocating
it.

Link: https://lore.kernel.org/r/d898489e-22ba-71f1-2f31-f1a78dc15849@gmail.comSigned-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>