UefiCpuPkg/MpInitLib: Add microcode definitions defined in IA32 SDM
UefiCpuPkg/MpInitLib: Add microcode definitions defined in IA32 SDM

Add microcode definitions defined in Intel(R) 64 and IA-32 Architectures
Software Developer's Manual Volume 3A, Section 9.11.

v4:
  1. ProcessorSignature type changed to CPU_MICROCODE_PROCESSOR_SIGNATURE
  2. Add pack(1) for structure CPU_MICROCODE_HEADER and
     CPU_MICROCODE_EXTENDED_TABLE.
v3:
  1. Update SDM date to June, 2016
  2. Mention BCD format in CPU_MICROCODE_DATE
  3. Rename ProcessorChecksum to Checksum to match SDM.

Cc: Michael Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Cc: Feng Tian <e66bb7e9f36c82a029035c5885acf75500d07e68@intel.com>
Cc: Giri P Mudusuru <25c53ebec15b492d82d7bf064153464c6e8fbfec@intel.com>
Cc: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <7d6fed0251a47076d6e691789131f22f07d057b4@intel.com>
Reviewed-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Reviewed-by: Michael Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Reviewed-by: Giri P Mudusuru <25c53ebec15b492d82d7bf064153464c6e8fbfec@intel.com>
Tested-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Tested-by: Michael Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>

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