ath9k_htc: add Altai WA1011N-GU

as reported in:
https://github.com/qca/open-ath9k-htc-firmware/pull/71#issuecomment-361100070



Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>