modules: update OpenWrt routing

This adds an important bugfix for BATMAN V users
("batman-adv: Fix own OGM check in aggregated OGMs").

b77498bd56 Merge pull request #603 from ecsv/batadv-for-19.07
6dea537c07 batman-adv: Merge bugfixes from 2020.3
0e5c75f536 Merge pull request #601 from bluewavenet/openwrt-19.07
ad8f02a4aa opennds: Backport v5.2.0
017d89d569 batctl: Enable build of mcast_flags subcommand

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>