UefiCpuPkg/SmmCpuFeaturesLib: Abstract arch dependent code

UefiCpuPkg/SmmCpuFeaturesLib: Abstract arch dependent code

BZ# 4093: Abstract SmmCpuFeaturesLib for sharing common code

This change stripped away the code that can be
shared with other archs or vendors from Intel
implementation and put in to the common file,
leaves the Intel X86 implementation in the
IntelSmmCpuFeatureLib. Also updates the header
file and INF file.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Abdul Lateef Attar <abdattar@amd.com>
Cc: Garrett Kirkendall <garrett.kirkendall@amd.com>
Cc: Paul Grimes <paul.grimes@amd.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>