MdeModulePkg/SecurityManagementLib: Mark the File parameter as OPTIONAL
    
    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2652
    
    According to the File description, the File is optional and can be NULL.
    
    Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
    Cc: Jian J Wang <jian.j.wang@intel.com>
    Cc: Hao A Wu <hao.a.wu@intel.com>
    Cc: Dandan Bi <dandan.bi@intel.com>
    Cc: Liming Gao <liming.gao@intel.com>
    
    Reviewed-by: Jian J Wang <jian.j.wang@intel.com>