SecurityPkg: Remove DxeDeferImageLoadLib in DSC

SecurityPkg: Remove DxeDeferImageLoadLib in DSC

The current version will cause build fail because DxeDeferImageLoadLib
exists in DSC file but it was actually deleted. So it should be removed.
https://bugzilla.tianocore.org/show_bug.cgi?id=1919

Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian Wang <jian.j.wang@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>