Control mutator order

Register mutators inside lambdas that are called in a defined order to
correctly order mutators before and after the arch and deps mutators.

Test: build.ninja identical
Change-Id: Iefe2a3515aee8570e76a6e76925db4cda0e9e822

android/register.go

@@ -58,6 +58,8 @@ func NewContext() *blueprint.Context {
 		ctx.RegisterSingletonType(t.name, t.factory)
 	}
 
+	registerMutators()
+
 	for _, t := range mutators {
 		var handle blueprint.MutatorHandle
 		if t.bottomUpMutator != nil {