Per UEFI spec UpdateImageSize may or may not include Firmware Image Authentication information. so for FMP auth capsule, UpdateImageSize should include the Image auth info. Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>