UefiCpuPkg/CpuMpPei: Add AsmHltLoop ()

UefiCpuPkg/CpuMpPei: Add AsmHltLoop ()

Add AsmHltLoop () in assembly code, it will not be copied into AP wakeup
buffer and invoked at end of ApCFunction (). To make sure AP work in case
AP wakeup buffer is restored to original data.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18013 6f19259b-4bc3-4df7-8a09-765794883524