Update clang-format

Refer:https://github.com/openbmc/docs/blob/ac5d544553934f8083c61c5986a1420261bc8a4c/style/cpp/.clang-format

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I593ddf950d14009ab77251fd6d3f248214661765
diff --git a/src/main.cpp b/src/main.cpp
index e1efd3e..624c9e7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,9 +17,10 @@
 #include "button_factory.hpp"
 #include "gpio.hpp"
 
-#include <fstream>
 #include <nlohmann/json.hpp>
 #include <phosphor-logging/elog-errors.hpp>
+
+#include <fstream>
 static constexpr auto gpioDefFile = "/etc/default/obmc/gpio/gpio_defs.json";
 
 using namespace phosphor::logging;