Parallelize singleton execution

Bug: 281536768
Test: manual, presubmits
Change-Id: I57fdc76ba6b277e88e196b506af87127a530fd37
diff --git a/android/api_levels.go b/android/api_levels.go
index fa919fd..2391e6c 100644
--- a/android/api_levels.go
+++ b/android/api_levels.go
@@ -22,7 +22,7 @@
 )
 
 func init() {
-	RegisterSingletonType("api_levels", ApiLevelsSingleton)
+	RegisterParallelSingletonType("api_levels", ApiLevelsSingleton)
 }
 
 const previewAPILevelBase = 9000