BaseTools: Dsc/Fdf conditional statement parse issue

Set PCD value with --pcd argument not replace DSC/Fdf PCD value.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>
(cherry picked from commit 1fa7fdf6ea)

BaseTools/Source/Python/Workspace/MetaFileParser.py

@@ -1243,6 +1243,10 @@ class DscParser(MetaFileParser):
         # PCD cannot be referenced in macro definition
         if self._ItemType not in [MODEL_META_DATA_DEFINE, MODEL_META_DATA_GLOBAL_DEFINE]:
             Macros.update(self._Symbols)
+        if GlobalData.BuildOptionPcd:
+            for Item in GlobalData.BuildOptionPcd:
+                PcdName, TmpValue = Item.split("=")
+                Macros[PcdName.strip()] = TmpValue
         return Macros
 
     def _PostProcess(self):