Clean up Fence a little.

Test: No functional change.

Change-Id: Ie0836b4bd589cbadf219d893b44f82f70a051174
diff --git a/camera/camera2/OutputConfiguration.cpp b/camera/camera2/OutputConfiguration.cpp
index 12d0da8..f4f2229 100644
--- a/camera/camera2/OutputConfiguration.cpp
+++ b/camera/camera2/OutputConfiguration.cpp
@@ -21,8 +21,9 @@
 #include <utils/Log.h>
 
 #include <camera/camera2/OutputConfiguration.h>
-#include <gui/Surface.h>
 #include <binder/Parcel.h>
+#include <gui/Surface.h>
+#include <utils/String8.h>
 
 namespace android {