Yes, I know that. They only got the mobile part of ATI though which mostly entailed 60 or so engineers and early mobile GPU designs. That was well over 10 years ago and around the time Imagination rejigged desktop GPU designs into their 1st offering of PowerVR chipsets.
Hard to say how much AMD IP Qualcomm still has access to as I'd expect much of that which originally got transferred is now reaching that magic age of maturity.
No doubt, Apple is working on bring much of the original patented iPhone material in-house these days including modem, GPU and CPU technologies.