ath10k: remove extra space on ath10k_update_channel_list

just to comply to coding style.
Signed-off-by: NEduardo Abinader <eduardo.abinader@riverbed.com>
Reviewed-by: NJulian Calaby <julian.calaby@gmail.com>
Signed-off-by: NKalle Valo <kvalo@qca.qualcomm.com>