BaseTools: use new shared GUID regular expressions

remove local variables that are GUID matching and replace with shared
expression.

Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/GenFds/FdfParser.py

@@ -1136,7 +1136,7 @@ class FdfParser:
 
         if not self.__GetNextToken():
             return False
-        if RangeExpression.RegGuidPattern.match(self.__Token) != None:
+        if gGuidPattern.match(self.__Token) != None:
             return True
         else:
             self.__UndoToken()