UefiCpuPkg/CpuCommonFeaturesLib: SMXE bit of CR4 should set

Add code to set SMXE in CR4 in the SmxInitialize flow when SMX is enabled.

Signed-off-by: Jason Voelz <jason.voelz@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>

UefiCpuPkg/Library/CpuCommonFeaturesLib/FeatureControl.c

@@ -240,6 +240,15 @@ SmxInitialize (
     Status = RETURN_UNSUPPORTED;
   }
 
+  CPU_REGISTER_TABLE_WRITE_FIELD (
+    ProcessorNumber,
+    ControlRegister,
+    4,
+    IA32_CR4,
+    Bits.SMXE,
+    (State) ? 1 : 0
+  )
+
   CPU_REGISTER_TABLE_TEST_THEN_WRITE_FIELD (
     ProcessorNumber,
     Msr,