AI chip king Nvidia is doing everything it can to defend its crown. That was much clear from CEO Jensen Huang’s GTC keynote address Tuesday. Whether it’s enough to restore the shine to the company’s stock in the coming days remains to be seen. During his roughly two-hour presentation at Nvidia’s premier showcase event, Huang announced several new hardware and software products — some predictable, some surprising — that reinforced Nvidia’s leadership position in the fast-moving artificial…