Fix library dependency, remove undeclarate deps

Remove undeclared dependency of libhwcomposer-client on Hwc.h which
created a circular dependency.

Test: Manual
Change-Id: I74d5c4e2db5d247f8b406d1ea42fece41e76659d
diff --git a/graphics/composer/2.1/default/Hwc.cpp b/graphics/composer/2.1/default/Hwc.cpp
index e6ff9e0..1497065 100644
--- a/graphics/composer/2.1/default/Hwc.cpp
+++ b/graphics/composer/2.1/default/Hwc.cpp
@@ -16,12 +16,12 @@
 
 #define LOG_TAG "HwcPassthrough"
 
-#include <type_traits>
+#include "Hwc.h"
 
+#include <type_traits>
 #include <log/log.h>
 
 #include "ComposerClient.h"
-#include "Hwc.h"
 #include "hardware/hwcomposer.h"
 #include "hwc2on1adapter/HWC2On1Adapter.h"