UefiCpuPkg/PiSmmCpuDxeSmm: Combine INIT-SIPI-SIPI.

UefiCpuPkg/PiSmmCpuDxeSmm: Combine INIT-SIPI-SIPI.

In S3 resume path, current implementation do 2 separate INIT-SIPI-SIPI,
this is not necessary. This change combine these 2 INIT-SIPI-SIPI to 1
and add CpuPause between them.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>