patches/openwrt: backport mac80211 patches for CVE-2020-3702
This PR backports patches for mac80211 related to CVE-2020-3702
Fixes issues:
- https://gitlab.nic.cz/turris/turris-build/-/issues/238
- https://gitlab.nic.cz/turris/turris-build/-/issues/239
It should be tested on multiple routers (mox,omnia) before it can be merged.
Edited by Jan Pavlinec