UefiCpuPkg|MdePkg: Move Register/ folder to MdePkg/Include/

UefiCpuPkg|MdePkg: Move Register/ folder to MdePkg/Include/

The patch moves all files under UefiCpuPkg/Include/Register/ to
MdePkg/Include/Register using following detailed approaches:
1. Move UefiCpuPkg/Include/Register/Amd/ to
   MdePkg/Include/Register/Amd folder.
2. Move remaining in UefiCpuPkg/Include/Register/ to
   MdePkg/Include/Register/Intel folder.
3. Create wrapper header files under UefiCpuPkg/Include/Register/
   to include the accordingly files in MdePkg/Include/Register/Intel.
   This is to avoid build break because code in other repos like
   edk2-platform includes the file from UefiCpuPkg.

The wrapper header files will be removed after all consumers code
is updated.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Signed-off-by: Eric Dong <eric.dong@intel.com>