fallout of cleaning-up libutils includes

Test: run & compile
Bug: n/a
Change-Id: I63585ed5a764b9ce7af2187b79ca0c83e683fd7f
diff --git a/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp b/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp
index deb6735..bf6af86 100644
--- a/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp
+++ b/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp
@@ -32,6 +32,8 @@
 
 #include <utils/Trace.h>
 
+#include <cutils/atomic.h>
+
 #include "Camera3StreamSplitter.h"
 
 namespace android {