[Cherry-Pick] MdeModulePkg: StatusCodeHandler Stmm remove assert

In StandaloneMM mode, IsStatusCodeUsingSerialPort is expecting to
find gMmStatusCodeUseSerialHobGuid, and will assert if it is not found.

Change the logic so that if the Guided Hob is not found, to let
the function return FALSE and progress to proceed.

Signed-off-by: Aaron Pop <aaronpop@microsoft.com>
(cherry picked from commit 4743d8d)

Author: apop5

MdeModulePkg/Universal/StatusCodeHandler/Smm/StatusCodeHandlerStandalone.c

@@ -29,11 +29,12 @@ IsStatusCodeUsingSerialPort (
   MM_STATUS_CODE_USE_SERIAL  *StatusCodeUseSerialHob;
 
   Hob = GetFirstGuidHob (&gMmStatusCodeUseSerialHobGuid);
-  ASSERT (Hob != NULL);
+  if (Hob != NULL) {
+    StatusCodeUseSerialHob = (MM_STATUS_CODE_USE_SERIAL *)GET_GUID_HOB_DATA (Hob);
+    return StatusCodeUseSerialHob->StatusCodeUseSerial;
+  }
 
-  StatusCodeUseSerialHob = (MM_STATUS_CODE_USE_SERIAL *)GET_GUID_HOB_DATA (Hob);
-
-  return StatusCodeUseSerialHob->StatusCodeUseSerial;
+  return FALSE;
 }
 
 /**