SecurityPkg: TcgConfigDxe: Move TPM state string update to CallBack function

TPM state string update requires HiiHandle which may not be initialized when calling ExtractConfig.
Move this logic to CallBack function.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>

SecurityPkg/Tcg/TcgConfigDxe/TcgConfigDriver.c

@@ -73,9 +73,15 @@ TcgConfigDriverEntryPoint (
   if (PrivateData == NULL) {
     return EFI_OUT_OF_RESOURCES;
   }
-  
+
+  PrivateData->Configuration = AllocatePool (sizeof (TCG_CONFIGURATION));
+  if (PrivateData->Configuration == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto ErrorExit;
+  }
+
   PrivateData->TcgProtocol = TcgProtocol;
-  
+
   //
   // Install TCG configuration form
   //