UefiCpuPkg/MpLib.c: Load microcode before mtrr sync per IA32 SDM
UefiCpuPkg/MpLib.c: Load microcode before mtrr sync per IA32 SDM

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=453
Cc: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>
Cc: Michael Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Cc: Feng Tian <e66bb7e9f36c82a029035c5885acf75500d07e68@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <7d6fed0251a47076d6e691789131f22f07d057b4@intel.com>
Reviewed-by: Feng Tian <e66bb7e9f36c82a029035c5885acf75500d07e68@intel.com>

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