Clean up Fence a little.

Test: Cleanup patch only. Fences still work.

Change-Id: I65e5cdf5e3c067bc475c085ab6d3577d9753231c
diff --git a/libs/ui/FenceTime.cpp b/libs/ui/FenceTime.cpp
index edcec99..8106b16 100644
--- a/libs/ui/FenceTime.cpp
+++ b/libs/ui/FenceTime.cpp
@@ -17,6 +17,7 @@
 #include <ui/FenceTime.h>
 
 #include <cutils/compiler.h>  // For CC_[UN]LIKELY
+#include <utils/Log.h>
 #include <inttypes.h>
 #include <stdlib.h>