```
net/aquantia-atlantic-kmod: Fix CURRENT build post r353868 (iflib changes)
This patch enable the port to build working if_atlantic.ko on 13-CURRENT, broken since r353868, where `if_multi_apply` and `if_multiaddr_count` were removed.
Differential_Revision: D28135
MFH: 2021Q1 (blanket: build fix)
```