With a backported patch from the OpenWrt trunk, it is now easy to generate an
equivalent configuration using CONFIG_ALL_KMODS.

The build will take a bit longer because all kernel module packages are actually
built even when they are not included in the image, but adding new targets
becomes a lot easier.

Also, related documentation updates and fixes.

Also add some patches from OpenWrt trunk and use the CT ath10k firmware.

While it isn't clear why this patch helps, it doesn't seem to have any negative
effects, so let's include it for now...

Otherwise, telnet login is allowed by default when neither a password nor SSH
keys are configured.

This significantly improves fastd performance, to the level it was before
Barrier Breaker.