Make BaseCachingPciExpressLib depend on PciPcdProducerLib, so that we have a chance to populate PcdPciExpressBaseAddress based on the contents of the device tree. Also update the platforms under ArmVirtPkg that support PCI to use the special MAX_UINT64 value as the build time default for PcdPciExpressBaseAddress. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>