BaseTools: update BinaryFiles.txt file to add Pkcs7Sign Tool

BaseTools: update BinaryFiles.txt file to add Pkcs7Sign Tool

add Pkcs7Sign.exe and related pem file into BinaryFiles.txt for build
server to automatically build the binary win32 files.

Cc: Liming Gao <liming.gao@intel.com>
CC: Erik Bjorge <erik.c.bjorge@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>