ath9k: fix a regression in ath9k_ps_restore

After 'ath9k: optimize ath9k_ps_restore', it would only send the device to
network sleep and not to full sleep anymore, potentially causing more
battery drain.

Reported-by: Vivek Natarajan <nataraja@qca.qualcomm.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/main.c

@@ -133,7 +133,7 @@ void ath9k_ps_restore(struct ath_softc *sc)
 	ath_hw_cycle_counters_update(common);
 	spin_unlock(&common->cc_lock);
 
-	ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
+	ath9k_hw_setpower(sc->sc_ah, mode);
 
  unlock:
 	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);