BaseTools: use in to compare single chars

instead if 3 Startswith for single chars, just use in with a list of chars

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/Common/Expression.py

@@ -835,7 +835,7 @@ class ValueExpressionEx(ValueExpression):
                         elif Item.startswith('UINT64'):
                             ItemSize = 8
                             ValueType = 'UINT64'
-                        elif Item.startswith('"') or Item.startswith("'") or Item.startswith('L'):
+                        elif Item[0] in ['"',"'",'L']:
                             ItemSize = 0
                             ValueType = 'VOID*'
                         else: