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/Android.mk b/services/surfaceflinger/Android.mk
index 56c539f..0e15506 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -93,7 +93,8 @@
 	libGLESv2 \
 	libbinder \
 	libui \
-	libgui
+	libgui \
+	libpowermanager
 
 LOCAL_MODULE:= libsurfaceflinger