UefiCpuPkg/Cpuid.h: Add CPUID defines and structures for Intel SGX

UefiCpuPkg/Cpuid.h: Add CPUID defines and structures for Intel SGX

Add Intel SGX Resource Enumeration Leaves as described by Section 37.7 in
Intel(R) 64 and IA-32 Architectures Software Developer's Manual, Volume 3D,
December 2015.

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: Michael Kinney <michael.d.kinney@intel.com>