UefiCpuPkg CpuCommFeaturesLib: Disable TraceEn at the beginning

UefiCpuPkg CpuCommFeaturesLib: Disable TraceEn at the beginning

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1809

Current code disables TraceEn at the end of ProcTraceInitialize(),
then there will be much memory allocated even when ProcTrace feature
is disabled.

This patch updates code to disable TraceEn and return at the beginning
of ProcTraceInitialize() when when ProcTrace feature is disabled.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Chandana Kumar <chandana.c.kumar@intel.com>
Cc: Kevin Li <kevin.y.li@intel.com>
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>