Dedup prebuilt mutator registration

Test: m checkbuild
Bug: 146540677
Change-Id: I9f8a11adf61fe6f352ec1eabc7c5bac332348ba2
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 969be63..de5fdf7 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -305,16 +305,10 @@
 	java.RegisterAppBuildComponents(ctx)
 
 	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
-	ctx.PreArchMutators(func(ctx android.RegisterMutatorsContext) {
-		ctx.BottomUp("prebuilts", android.PrebuiltMutator).Parallel()
-	})
+	android.RegisterPrebuiltMutators(ctx)
 	ctx.PreDepsMutators(RegisterPreDepsMutators)
 	ctx.PostDepsMutators(android.RegisterOverridePostDepsMutators)
 	ctx.PostDepsMutators(RegisterPostDepsMutators)
-	ctx.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
-		ctx.TopDown("prebuilt_select", android.PrebuiltSelectModuleMutator).Parallel()
-		ctx.BottomUp("prebuilt_postdeps", android.PrebuiltPostDepsMutator).Parallel()
-	})
 
 	ctx.Register(config)