AI is a tool
We are not talking about a self aware intelligence that can make it's own decisions. If we get there, then we can have a different conversation. But right now AI is a tool. It can use inputs to process complex problems. A bunch of humans created the AI. One or more humans refined a series of inputs until they got a usable result. One or more humans selected which results to apply for a patent on. Humans switch the power to the AI on and off. Until an AI can create a design without nay input and without filtering the output, they should not have the ability to hold a patent.