ath9k: add support for reporting tx power to mac80211

Track it per channel context instead of in the softc

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -347,6 +347,7 @@ struct ath_chanctx {
 
 	int flush_timeout;
 	u16 txpower;
+	u16 cur_txpower;
 	bool offchannel;
 	bool stopped;
 	bool active;
@@ -987,7 +988,6 @@ struct ath_softc {
 	u8 gtt_cnt;
 	u32 intrstatus;
 	u16 ps_flags; /* PS_* */
-	u16 curtxpow;
 	bool ps_enabled;
 	bool ps_idle;
 	short nbcnvifs;