UefiCpuPkg/S3Resume2Pei: Send S3 resume finished event to SmmCore.

UefiCpuPkg/S3Resume2Pei: Send S3 resume finished event to SmmCore.

Driver will send S3 resume finished event to SmmCore through communicate
buffer after it signals EndOfPei event.

V2 Changes:
1. Change structures name to avoid they start with EFI_.
2. Base on DXE phase bits to provide communication buffer, current implement
check both PEI and DXE phase.

V3 Changes:
1. Change structure name for better understanding.
2. Enhance communication buffer calculate logic to more accurate.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jiewen Yao <jiewen.yao@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>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>