ath: unshare struct ath_bus_ops between ath5k and ath9k

This struct is not used in any common code, and moving it out of
the ath header makes it easier to add more driver specific ops.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index a778b66..073bc9e 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -846,6 +846,14 @@
 	u32 ent_mode;
 };
 
+struct ath_bus_ops {
+	enum ath_bus_type ath_bus_type;
+	void (*read_cachesize)(struct ath_common *common, int *csz);
+	bool (*eeprom_read)(struct ath_common *common, u32 off, u16 *data);
+	void (*bt_coex_prep)(struct ath_common *common);
+	void (*extn_synch_en)(struct ath_common *common);
+};
+
 static inline struct ath_common *ath9k_hw_common(struct ath_hw *ah)
 {
 	return &ah->common;