Now that the PCI root bridge driver and various host controller drivers have been fixed, remove the 4 GB limit on PCI DMA allocation for QEMU's ECAM PCI host bridge. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>