ArmVirtualizationPkg/PciHostBridgeDxe: set Root Bridge apertures from PCDs
    
    Our PciHostBridgeDxe module creates one root bridge on the one and only
    host bridge. The resource apertures of the root bridge (bus range, IO
    space, MMIO space) are configured with the "mResAperture" array, which at
    the moment carries static values inherited from PcAtChipsetPkg.
    
    Set the array as first thing from the PCDs that we parsed from the device
    tree.
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Laszlo Ersek <lersek@redhat.com>