BaseTools: Fix a bug for --pcd used in ConditionalStatement calculate

Move the GlobalData.BuildOptionPcd before FdfParser() function and add
type check for Pcd item.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
(cherry picked from commit 705ed563de)

BaseTools/Source/Python/GenFds/FdfParser.py

@@ -927,6 +927,8 @@ class FdfParser:
         MacroDict.update(GlobalData.gCommandLineDefines)
         if GlobalData.BuildOptionPcd:
             for Item in GlobalData.BuildOptionPcd:
+                if type(Item) is tuple:
+                    continue
                 PcdName, TmpValue = Item.split("=")
                 TmpValue = BuildOptionValue(TmpValue, {})
                 MacroDict[PcdName.strip()] = TmpValue