wifi: ath9k: Remove unused declarations

Commit b57ba3b2 ("ath9k: move ath9k_reload_chainmask_settings to common")
removed the implementation ath9k_reload_chainmask_settings() but not the declaration.
Also commit 978f78bf ("ath9k_hw: Move bt_stomp to hw from common.") left behind
ath9k_cmn_btcoex_bt_stomp() declaration.
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230810145222.34364-1-yuehaibing@huawei.com

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

@@ -1129,7 +1129,6 @@ void ath_restart_work(struct ath_softc *sc);
 int ath9k_init_device(u16 devid, struct ath_softc *sc,
 		    const struct ath_bus_ops *bus_ops);
 void ath9k_deinit_device(struct ath_softc *sc);
-void ath9k_reload_chainmask_settings(struct ath_softc *sc);
 u8 ath_txchainmask_reduction(struct ath_softc *sc, u8 chainmask, u32 rate);
 void ath_start_rfkill_poll(struct ath_softc *sc);
 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw);

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

@@ -85,8 +85,6 @@ struct ath9k_channel *ath9k_cmn_get_channel(struct ieee80211_hw *hw,
 					    struct ath_hw *ah,
 					    struct cfg80211_chan_def *chandef);
 int ath9k_cmn_count_streams(unsigned int chainmask, int max);
-void ath9k_cmn_btcoex_bt_stomp(struct ath_common *common,
-				  enum ath_stomp_type stomp_type);
 void ath9k_cmn_update_txpow(struct ath_hw *ah, u16 cur_txpow,
 			    u16 new_txpow, u16 *txpower);
 void ath9k_cmn_init_crypto(struct ath_hw *ah);