Parallelize singleton execution

Bug: 281536768
Test: manual, presubmits
Change-Id: I57fdc76ba6b277e88e196b506af87127a530fd37
diff --git a/android/register.go b/android/register.go
index c57964c..64b0207 100644
--- a/android/register.go
+++ b/android/register.go
@@ -231,7 +231,7 @@
 func collateGloballyRegisteredSingletons() sortableComponents {
 	allSingletons := append(sortableComponents(nil), singletons...)
 	allSingletons = append(allSingletons,
-		singleton{pre: false, parallel: false, name: "bazeldeps", factory: BazelSingleton},
+		singleton{pre: false, parallel: true, name: "bazeldeps", factory: BazelSingleton},
 
 		// Register phony just before makevars so it can write out its phony rules as Make rules
 		singleton{pre: false, parallel: false, name: "phony", factory: phonySingletonFactory},