ath: Add a bus type field

This can be used to store the bus types ( AHB/PCI/USB ).

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/htc_drv_init.c

@@ -287,6 +287,7 @@ static bool ath_usb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
 }
 
 static const struct ath_bus_ops ath9k_usb_bus_ops = {
+	.ath_bus_type = ATH_USB,
 	.read_cachesize = ath_usb_read_cachesize,
 	.eeprom_read = ath_usb_eeprom_read,
 };