Revert "UefiCpuPkg/PiSmmCpu: Enable 5 level paging when CPU supports"

Revert "UefiCpuPkg/PiSmmCpu: Enable 5 level paging when CPU supports"

This reverts commit 7365eb2c8cf1d7112330d09918c0c67e8d0b827a.
Commit
7c5010c7f8 MdePkg/BaseLib.h: Update IA32_CR4 structure for 5-level paging
technically breaks the EDKII development process documented in
https://github.com/tianocore/tianocore.github.io/wiki/EDK-II-Development-Process
and Maintainers.txt in EDKII repo root directory.

The voilation is commit 7c5010c7f8 doesn't have a Reviewed-by or
Acked-by from MdePkg maintainers.

In order to revert 7c5010c7f8, 7365eb2c8 needs to revert first otherwise
simply reverting 7c5010c7f8 will cause build break.

Signed-off-by: Ray Ni <ray.ni@intel.com>