UefiCpuPkg/PiSmmCpuDxeSmm: Consume new APIs

UefiCpuPkg/PiSmmCpuDxeSmm: Consume new APIs

Consuming PeCoffSerachImageBase() from PeCoffGetEntrypointLib and consuming
DumpCpuContext() from CpuExceptionHandlerLib to replace its own implementation.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>