SurfaceFlinger: send VSYNC power hints to IPowerManager

VSYNC power hints are now sent via binder to IPowerManager.
SurfaceFlinger no longer loads a second copy of the PowerHAL.
VSYNC power hints are sent in batches and not on per frame basis.

Change-Id: Ia5a839ab3c857cffae7089f810b4315d4ed23fcf
diff --git a/services/surfaceflinger/DisplayHardware/PowerHAL.h b/services/surfaceflinger/DisplayHardware/PowerHAL.h
index ef67b8f..e5f82a9 100644
--- a/services/surfaceflinger/DisplayHardware/PowerHAL.h
+++ b/services/surfaceflinger/DisplayHardware/PowerHAL.h
@@ -19,7 +19,9 @@
 
 #include <stdint.h>
 #include <sys/types.h>
+#include <utils/Mutex.h>
 
+#include <powermanager/IPowerManager.h>
 #include <hardware/power.h>
 
 namespace android {
@@ -28,15 +30,11 @@
 class PowerHAL
 {
 public:
-    PowerHAL();
-    ~PowerHAL();
-
-    status_t initCheck() const;
     status_t vsyncHint(bool enabled);
 
 private:
-    power_module_t*   mPowerModule;
-    bool mVSyncHintEnabled;
+    sp<IPowerManager> mPowerManager;
+    Mutex mlock;
 };
 
 // ---------------------------------------------------------------------------