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/inc/button_factory.hpp b/inc/button_factory.hpp
index 1c513ef..0d427f7 100644
--- a/inc/button_factory.hpp
+++ b/inc/button_factory.hpp
@@ -4,6 +4,7 @@
 #include "gpio.hpp"
 
 #include <phosphor-logging/elog-errors.hpp>
+
 #include <unordered_map>
 
 using buttonIfCreatorMethod = std::function<std::unique_ptr<ButtonIface>(
@@ -16,7 +17,6 @@
 
 class ButtonFactory
 {
-
   public:
     static ButtonFactory& instance()
     {
@@ -35,7 +35,6 @@
     template <typename T>
     void addToRegistry()
     {
-
         buttonIfaceRegistry[std::string(T::getFormFactorName())] =
             [](sdbusplus::bus::bus& bus, EventPtr& event,
                buttonConfig& buttonCfg) {
@@ -52,7 +51,6 @@
                                                 EventPtr& event,
                                                 buttonConfig& buttonCfg)
     {
-
         // find matching name in the registry and call factory method.
         auto objectIter = buttonIfaceRegistry.find(name);
         if (objectIter != buttonIfaceRegistry.end())