I just installed v7.90.002 on my z8300 Intel Compute Stick, and HDMI audio is working great. Glad to see you guys are on top of this. I've been waiting for a linux release of some sort since I got it. Windows 10 is fine, but way too bulky for running a Kodi box. Thank you for all of your hard work.
Did you apply the patch yourself or was it already applied for the generic 002 alpha build? Have you tried the 003 build? If so would you be able to provide either of the img/tar?
I have tried the recent 004 alpha build and it seems to not have the audio patch applied to the kernal? Was it removed?