IntelSiliconPkg: Update MicrocodeUpdate to build with the package

IntelSiliconPkg: Update MicrocodeUpdate to build with the package

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=540

This is after patch
"IntelSiliconPkg: Move MicrocodeUpdate from UefiCpuPkg".

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Regression-tested-by: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>