modules: update routing

0c19201 nodogsplash: update to 4.0.3
b682059 Merge pull request #564 from ecsv/batadv-for-18.06
719709a batman-adv: Merge bugfixes from 2020.1
4e78587 batctl: Merge bugfixes from 2020.1
300fec3 Merge pull request #555 from ecsv/batadv-for-18.06
8f8ab76 batman-adv: Merge bugfixes from 2020.0
0e63ef9 quagga: update to version 1.1.1 (#541)
9fa2b24 [OpenWrt 18.06] bird: Update to version 1.6.8 (security fix) (#539)

Build-tested: x86-64, ipq40xx