update .clang-format header inclusion order

Added the header inclusion order to the .clang-format file generated
these changes.

Change-Id: Ia31b21d7ea451cac0309828006bc17c27cbd5bd5
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/utility/tuple_to_array.cpp b/test/utility/tuple_to_array.cpp
index bf73783..0b79170 100644
--- a/test/utility/tuple_to_array.cpp
+++ b/test/utility/tuple_to_array.cpp
@@ -1,4 +1,5 @@
 #include <sdbusplus/utility/tuple_to_array.hpp>
+
 #include <gtest/gtest.h>
 
 TEST(TupleToArray, Test3Chars)