OvmfPkg: import SmmCpuFeaturesLib from UefiCpuPkg
    
    The next patches will customize the implementation, but let's start from
    the common version to better show the changes.
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    [lersek@redhat.com: drop UNI file, keep whitespace intact, generate new
     FILE_GUID, split off DSC changes, reflow commit message, refresh against
     SVN r18958]
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Laszlo Ersek <lersek@redhat.com>