UefiCpuPkg/MicrocodeUpdate: Add MP support.

UefiCpuPkg/MicrocodeUpdate: Add MP support.

Support the case that BSP and AP are using different Microcode.
The previous logic validates new MCU on BSP only.
The enhanced logic will validate MCU on every BSP and AP.
As long as one processor loads the MCU successfully, it will be updated.

Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Star Zeng <star.zeng@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>