MdePkg/StatusCodeDataTypeId.h: Add new definition per PI1.7 Spec
    
    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1398
    
    According to PI1.7 Spec, add the new definition
    EFI_RETURN_STATUS_EXTENDED_DATA in StatusCodeDataTypeId.h
    
    Cc: Michael D Kinney <michael.d.kinney@intel.com>
    Cc: Liming Gao <liming.gao@intel.com>
    Cc: Laszlo Ersek <lersek@redhat.com>
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Dandan Bi <dandan.bi@intel.com>
    Reviewed-by: Laszlo Ersek <lersek@redhat.com>
    Reviewed-by: Ray Ni <ray.ni@intel.com>