profiles: add support for the TL-WA901N/ND v2
Update OpenWRT and mac80211
Add support for the TP-LINK TL-WR841N/ND v9
Update upstream modules

This updates OpenWRT and rebases our patches.

Furthermore, the mac80211 module is removed as currently the Attitude Adjustment
main repo has a newer version (and some fixes that aren't in the backport repo).

Also, update odhcp6c from Barrier Breaker.
Update netifd from Barrier Breaker

This allows us to drop our config mode patch.
netifd: fix proto none crash
Update netifd again
Also update ubus alongside netifd and libubox
Add profile for D-Link DIR-825 rev. B1
Fix a few error messages and other strangeness on `make update` in a clean tree
Merged updates from upstream & resolved conflicts