De acordo com wireless.wiki.kernel , há duas maneiras de obter o wifi trabalhando:
1) Compile uma nova versão do kernel pelo menos a 4.0
ou
2) Usando o backport
It is possible to use newer ath10k driver on an older kernel with backports project.
Download latest backports release from here and unpack it.
Run defconfig for ath10k:
make defconfig-ath10k
Compile backports:
make
Install backports:
sudo make install
Reboot system and ath10k should load automatically.