The batman-adv for non-802.11ax devices was a completely different one than
for 802.11ax devices. The latter is using a private copy because the QCA
kernel is extremely old and doesn't match the kernel from OpenWrt 21.02.
And the mac80211 version (and its backports/compat code) is not fully
compatible with the official one.
At least import the newest version from openwrt-routing openwrt-21.02 and
change to build against the special kernel and mac80211 version.
The used commit from openwrt-routing is 5d09821ed7c4 ("batman-adv: Always
send iface index+name in genlmsg")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
