UefiCpuPkg/SmmCpuFeaturesLib: replace hard-coded machine code

UefiCpuPkg/SmmCpuFeaturesLib: replace hard-coded machine code

Replace hard-coded machine code with equivalent assembly source code.
Changes tested by checking for machine code equivalence by disassembling
the original and changed code.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chris Ruffin <chris.ruffin@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>