UefiCpuPkg: Add SmmCpuFeaturesLib

UefiCpuPkg: Add SmmCpuFeaturesLib

Add SmmCpuFeaturesLib that provides CPU specific functions that are
used to initialize SMM and process SMIs.  A functional implementation
of this library class is provided that is based on the
Intel(R) 64 and IA-32 Architectures Software Developer's Manual

[jeff.fan@intel.com: Fix code style issues reported by ECC]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18638 6f19259b-4bc3-4df7-8a09-765794883524