AML: Can't re-create full name of value during traverse

[rw-vanc]

There does not seem to be a public function to create an AmlName from parent + nameseg. This makes re-creating the AmlName for a nameseg during traverse into a chore.

[IsaacWoods]

If I understand correctly, this would be AmlName::from_name_seg(foo).resolve(&parent)? which isn't too bad imo - if this is too verbose I'm happy for a new method to be contributed :)