UefiCpuPkg/PiSmmCpuDxeSmm: add message for S3 config error

UefiCpuPkg/PiSmmCpuDxeSmm: add message for S3 config error

BZ#: https://bugzilla.tianocore.org/show_bug.cgi?id=1165

HOB gEfiAcpiVariableGuid is a must have data for S3 resume if
PcdAcpiS3Enable is set to TRUE. Current code in CpuS3.c doesn't
embody this strong binding between them. An error message and
CpuDeadLoop are added in this patch to warn platform developer
about it.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>