dt-bindings: net: wireless: ath9k: Change Toke as maintainer

Toke now maintains ath9k so update DT bindings as well.

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220610133640.10810-1-kvalo@kernel.org