ath9k_hw: add helpers for processing the AR9003 INI

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.h b/drivers/net/wireless/ath/ath9k/ar9003_phy.h
index 2e51e57..70e647b 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.h
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.h
@@ -801,4 +801,6 @@
 
 #define AR_PHY_BB_WD_STATUS_CLR         0x00000008
 
+void ar9003_hw_set_chain_masks(struct ath_hw *ah, u8 rx, u8 tx);
+
 #endif  /* AR9003_PHY_H */