Merge pull request #2791 from FreifunkVogtland/war-ath79-hang

ath79-generic: Work around boot hang on Unifi AC-Mesh

targets/ath79-generic

+-- modify kernel builds slightly to work around a boot hang on various device
+-- based on the QCA9563 SoC - especially the Unifi AC-* devices
+config('KERNEL_AIO', true)
+
 -- enforce mainline ath10k kmod/firmware over openwrt default ath10k-ct usage
 -- ath10k-ct is unstable/broken with 11s meshing, works only wave2 chipsets