Register the propagateRROEnforcementMutator

This adds the registration of the mutator to the existing register...
method which will include it in PrepareForTestWithJavaBuildComponents.

Bug: 182885307
Test: m nothing
Change-Id: I6cea716a3ff4d8abdb80543b7e0ddf22246ffa30

java/java_test.go

@@ -126,10 +126,6 @@ func testContext(config android.Config) *android.TestContext {
 	// Register module types and mutators from cc needed for JNI testing
 	cc.RegisterRequiredBuildComponentsForTest(ctx)
 
-	ctx.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
-		ctx.TopDown("propagate_rro_enforcement", propagateRROEnforcementMutator).Parallel()
-	})
-
 	return ctx
 }