UefiCpuPkg/PiSmmCpuDxeSmm: move InitSmmS3Cr3() into else block

UefiCpuPkg/PiSmmCpuDxeSmm: move InitSmmS3Cr3() into else block

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

InitSmmS3Cr3 () will update SmmS3ResumeState so moving the calling of
it into else block to keep the logic consistency.

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>