ath9k: Fix Notice of Absence issues

* The index has to incremented only when advertising
  a new NoA schedule.

* Switch to non-periodic NoA when starting a scan operation
  and multiple channel contexts are active.

* Make sure that periodic NoA is advertised again when
  scan ends. Since the offchannel timer moves the offchannel
  state to IDLE after the GO operating channel becomes
  active, use a flag "force_noa_update" to update the
  NoA contents.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 0c071b0..305db1a 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -379,6 +379,7 @@
 	bool beacon_pending;
 	bool offchannel_pending;
 	bool wait_switch;
+	bool force_noa_update;
 	enum ath_chanctx_state state;
 	u8 beacon_miss;
 
@@ -595,8 +596,10 @@
 	u32 offchannel_start;
 	u32 offchannel_duration;
 
-	u32 periodic_noa_start;
-	u32 periodic_noa_duration;
+	/* These are used for both periodic and one-shot */
+	u32 noa_start;
+	u32 noa_duration;
+	bool periodic_noa;
 };
 
 struct ath9k_vif_iter_data {