ath9k: Move PS wakeup/restore calls from isr to tasklet

We do not need to do this in ath_isr() and it looks like the modified
version ends up being more stable as far as being able receive beacon
frames is concerned. Furthermore, this reduces need to move between
AWAKE and NETWORK SLEEP states when processing some unrelated
interrupts.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -508,8 +508,6 @@ static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
 static void ath_rx_ps_back_to_sleep(struct ath_softc *sc)
 {
 	sc->sc_flags &= ~(SC_OP_WAIT_FOR_BEACON | SC_OP_WAIT_FOR_CAB);
-	if (sc->hw->conf.flags & IEEE80211_CONF_PS)
-		ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
 }
 
 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)