UefiCpuPkg/PiSmmCpu: Use new PCD PcdCpuSmmRestrictedMemoryAccess

UefiCpuPkg/PiSmmCpu: Use new PCD PcdCpuSmmRestrictedMemoryAccess

The patch changes PiSmmCpu driver to consume PCD
PcdCpuSmmRestrictedMemoryAccess.
Because the behavior controlled by PcdCpuSmmStaticPageTable in
original code is not changed after switching to
PcdCpuSmmRestrictedMemoryAccess.

The functionality is not impacted by this patch.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>