Change storage duration to static for native choreographer.

This ensures that the region is zero initialized, regardless of compiler.

Change-Id: Ie0bfa5d2cd2486ba31a45aee4de6c370513bfc62

native/android/choreographer.cpp

@@ -82,7 +82,7 @@ private:
 };
 
 
-thread_local Choreographer* gChoreographer;
+static thread_local Choreographer* gChoreographer;
 Choreographer* Choreographer::getForThread() {
     if (gChoreographer == nullptr) {
         sp<Looper> looper = Looper::getForThread();