Parallelize singleton execution

Bug: 281536768
Test: manual, presubmits
Change-Id: I57fdc76ba6b277e88e196b506af87127a530fd37
diff --git a/java/hiddenapi_singleton.go b/java/hiddenapi_singleton.go
index 52934a3..d4ee4fc 100644
--- a/java/hiddenapi_singleton.go
+++ b/java/hiddenapi_singleton.go
@@ -25,7 +25,7 @@
 }
 
 func RegisterHiddenApiSingletonComponents(ctx android.RegistrationContext) {
-	ctx.RegisterSingletonType("hiddenapi", hiddenAPISingletonFactory)
+	ctx.RegisterParallelSingletonType("hiddenapi", hiddenAPISingletonFactory)
 }
 
 var PrepareForTestWithHiddenApiBuildComponents = android.FixtureRegisterWithContext(RegisterHiddenApiSingletonComponents)