bugfix, misspelling

Signed-off-by: Nweichaox <wangweichao2@huawei.com>
Change-Id: I91b21ec1e3a7bf83dd5e269064a7814ff50b8533

hb_internal/common/product.py

@@ -130,8 +130,8 @@ class Product():
             board = info.get('board')
             _board_path = info.get('board_path')
             if _board_path and os.path.exists(
-                    os.path.json(config.root_path, _board_path)):
-                board_path = os.path.json(config.root_path, _board_path)
+                    os.path.join(config.root_path, _board_path)):
+                board_path = os.path.join(config.root_path, _board_path)
             else:
                 board_path = os.path.join(config.root_path, 'device',
                                           device_company, board)