BaseTools: Update sign tool to make MonotonicCount *after* Payload

BaseTools: Update sign tool to make MonotonicCount *after* Payload

The WIN_CERTIFICATE_UEFI_GUID AuthInfo defined in the UEFI spec
mentioned that It is a signature across the image data and the
Monotonic Count value. After clarification, we do the signature
calculation, we put MonotonicCount after Payload.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@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>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Tested-by: Jiewen Yao <jiewen.yao@intel.com>