modules: update routing

c52779c Merge pull request #520 from ecsv/batadv-for-18.06
ee3264b batman-adv: Merge bugfixes from 2019.4
049cb8a Merge pull request #511 from adrianschmutzler/babeld1806
e80f582 babeld: Update to version 1.8.5
6e50f8b nodogsplash: Backport Version 4.0.1. (#493)
a551935 nodogsplash: Backport of Version 4.0.0. (#486)
bb156bf Merge pull request #455 from BKPepe/bird-openwrt18.06
d3f317b bird: update to version 1.6.6