Release VectorDrawable cache surface on render thread

Release VectorDrawable cache surface on render thread.
This is fixing an assert in skia GrSingleOwner.h:33.

Test: Ran gmail before and after the change.
Bug: 64842607
Change-Id: I46e0c2557ac5b2fc3be2cc2d35abf96f6d6c9399
diff --git a/libs/hwui/renderthread/RenderProxy.h b/libs/hwui/renderthread/RenderProxy.h
index 06eaebd..9440b15 100644
--- a/libs/hwui/renderthread/RenderProxy.h
+++ b/libs/hwui/renderthread/RenderProxy.h
@@ -143,6 +143,8 @@
 
     static void repackVectorDrawableAtlas();
 
+    static void releaseVDAtlasEntries();
+
 private:
     RenderThread& mRenderThread;
     CanvasContext* mContext;