UefiCpuPkg: Split the path in RelocateApLoop into two.

Add the union RELOCATE_AP_LOOP_ENTRY, split the path in RelocateApLoop
 into two:
 1. 64-bit AMD processors with SEV-ES
 2. Intel processors (32-bit or 64-bit), 32-bit AMD processors, or
 64-bit AMD processors without SEV-ES.

Cc: Guo Dong <guo.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james.lu@intel.com>
Cc: Gua Guo <gua.guo@intel.com>
Signed-off-by: Yuanhao Xie <yuanhao.xie@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>