Fix EDKT497. In the patch:

1) Check TPL<=TPL_CALLBACK prior to invoking SerialIO protocol.
2) Check TPL <= TPL_NOTIFY prior to allocate memory in datahub status code driver.
3) Add lock to prevent the critical data.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2225 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Universal/StatusCode/Dxe/Common/DxeStatusCodeCommon.c

@@ -148,6 +148,9 @@ ReportDispatcher (
   IN EFI_STATUS_CODE_DATA     *Data      OPTIONAL
   )
 {
+	volatile int tt = 1;
+	while (tt) {
+	}
   //
   // Use atom operation to avoid the reentant of report.
   // If current status is not zero, then the function is reentrancy.