Add gEdkiiS3MtrrSettingGuid a new GUID for s3 MTRR setting. This GUID will be used to save MTRR_SETTINGS at EndOfDxe by LockBox and restore at S3 boot PEI phase for s3 usage. Signed-off-by: Dun Tan <dun.tan@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>