Delete PiSmmCommunicationAcpiTable.h and delete SMM Communication ACPI Table definition in UefiAcpiDataTable.h. As EFI_SMM_COMMUNICATE_HEADER is defined in both PI spec vol 4 and UEFI spec, move its definition to SmmCommunication.h. Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>