UefiCpuPkg/CpuDxe: Copy two functions from PciHostBridge
    
    Copy AddMemoryMappedIoSpace() and IntersectMemoryDescriptor() from
    MdeModulePkg\Bus\Pci\PciHostBridgeDxe\PciHostBridge.c.
    
    https://bugzilla.tianocore.org/show_bug.cgi?id=390
    
    Cc: Laszlo Ersek <lersek@redhat.com>
    Cc: Jiewen Yao <jiewen.yao@intel.com>
    Cc: Feng Tian <feng.tian@intel.com>
    Cc: Michael D Kinney <michael.d.kinney@intel.com>
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Jeff Fan <jeff.fan@intel.com>
    Reviewed-by: Laszlo Ersek <lersek@redhat.com>
    Regression-tested-by: Laszlo Ersek <lersek@redhat.com>