Update clang-format

refer: https://github.com/openbmc/docs/blob/master/style/cpp/.clang-format

Tested: built openpower-occ-control successfully.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I136870023229ff906d471dd4d8debfd404812ff1
diff --git a/powermode.cpp b/powermode.cpp
index af739cb..32af335 100644
--- a/powermode.cpp
+++ b/powermode.cpp
@@ -1,11 +1,12 @@
 #include <fmt/core.h>
 
-#include <cassert>
 #include <phosphor-logging/log.hpp>
 #include <powermode.hpp>
-#include <regex>
 #include <xyz/openbmc_project/Control/Power/Mode/server.hpp>
 
+#include <cassert>
+#include <regex>
+
 namespace open_power
 {
 namespace occ