UefiCpuPkg: Put APs in 64 bit mode before handoff to OS.

UefiCpuPkg: Put APs in 64 bit mode before handoff to OS.

Add the 'AsmRelocateApLoopStartGeneric' for X64 processors except 64-bit
 AMD processors with SEV-ES.

Remove the unused arguments of AsmRelocateApLoopStartGeneric, updated
the stack offset.

Create PageTable for the allocated reserved memory.

Only keep 4GB limitation of memory allocation for the case APs still
need to be transferred to 32-bit mode before OS.

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>