SecurityPkg: Cleanup unused structure definition

SecurityPkg: Cleanup unused structure definition

This patch is used to cleanup unused structure
definition.

Cc: Zhang Chao B <chao.b.zhang@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>