Thanks for reply, I have an APU and since then I figure out, I actually did a tutorial and some patches for 5G.
The main culprit were wrong firmware file, and hostap version so I compiled a newer version in order to support AC.
Also the support for 5G is wrong, my patches address some of this.
The menu you are talking about is missing in normal 3.7.1 release. This means that some integration work should be done in order to bring both releases on the same page.