clang-format: Sort using statements

Make using order consistent where used. There aren't any in this
project, but this should be used more widely by openbmc projects.

Change-Id: I22b16c9d57415e3df7e36a5be66aec1fa86b6a53
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/.clang-format b/.clang-format
index 42a2307..27f96ff 100644
--- a/.clang-format
+++ b/.clang-format
@@ -82,6 +82,7 @@
 PointerAlignment: Right
 ReflowComments:  true
 SortIncludes:    true
+SortUsingDeclarations: true
 SpaceAfterCStyleCast: false
 SpaceBeforeAssignmentOperators: true
 SpaceBeforeParens: ControlStatements