Change storage duration to static for native choreographer.

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

Change-Id: Ie0bfa5d2cd2486ba31a45aee4de6c370513bfc62
diff --git a/native/android/choreographer.cpp b/native/android/choreographer.cpp
index cc2fd77..e35c85b 100644
--- a/native/android/choreographer.cpp
+++ b/native/android/choreographer.cpp
@@ -82,7 +82,7 @@
 };
 
 
-thread_local Choreographer* gChoreographer;
+static thread_local Choreographer* gChoreographer;
 Choreographer* Choreographer::getForThread() {
     if (gChoreographer == nullptr) {
         sp<Looper> looper = Looper::getForThread();