UefiCpuPkg: Revert "UefiCpuPkg: Enable Tdx support in MpInitLib"

UefiCpuPkg: Revert "UefiCpuPkg: Enable Tdx support in MpInitLib"

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3918

This reverts commit 88da06ca763eb6514565c1867a801a427c1f3447.
This commit triggers the ASSERT in Non-Td guest.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>