ath9k: Cleanup mgd_prepare_tx callback

Rename the callback from ath9k_chanctx_force_active()
to ath9k_mgd_prepare_tx(). Also, move it to main.c and
group it with the other callbacks.

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 f3455ce..f9863e6 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -408,8 +408,6 @@
 	     ctx <= &sc->chanctx[ARRAY_SIZE(sc->chanctx) - 1];      \
 	     ctx++)
 
-void ath9k_chanctx_force_active(struct ieee80211_hw *hw,
-				struct ieee80211_vif *vif);
 static inline struct ath_chanctx *
 ath_chanctx_get(struct ieee80211_chanctx_conf *ctx)
 {
@@ -446,6 +444,8 @@
 void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
 				struct ieee80211_vif *vif);
 void ath9k_p2p_ps_timer(void *priv);
+
+void ath_chanctx_set_next(struct ath_softc *sc, bool force);
 #else
 static inline bool ath9k_is_chanctx_enabled(void)
 {