UefiCpuPkg/UefiCpuPkg.dec: Add Microcode capsule related definition.

UefiCpuPkg/UefiCpuPkg.dec: Add Microcode capsule related definition.

1) Add Microcode capsule related GUID.
   gMicrocodeFmpImageTypeIdGuid
2) Add Microcode capsule related library.
   MicrocodeFlashAccessLib

Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>