ath10k: remove unused dl_is_polled

Since polling for received messages not supported, remove unused
dl_is_polled.

Reviewed-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
4 files changed