UefiCpuPkg/PiSmmCpuDxeSmm: SMM_CPU_DATA_BLOCK is not cleared

UefiCpuPkg/PiSmmCpuDxeSmm: SMM_CPU_DATA_BLOCK is not cleared

The commit 8b9311 changed the zeroing of mSmmMpSyncData of type
SMM_DISPATCHER_MP_SYNC_DATA by the following patch.
 -    ZeroMem (mSmmMpSyncData, mSmmMpSyncDataSize);
 +    mSmmMpSyncData->SwitchBsp = FALSE;

mSmmMpSyncDataSize not only includes SMM_DISPATCHER_MP_SYNC_DATA, but
also includes the SMM_CPU_DATA_BLOCK array and one BOOLEAN variable
array as shown here:

  mSmmMpSyncDataSize = sizeof (SMM_DISPATCHER_MP_SYNC_DATA) +
       (sizeof (SMM_CPU_DATA_BLOCK) + sizeof (BOOLEAN)) *
       gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus;

This patch restores the original ZeroMem() to clear all CPU Sync data.
The commit 8b9311 may cause unexpected behavior.

v2:
  Mentioned CandidateBsp array in comments to make it more accurate.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>