Make ar9170 use common ath reg code

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/Kconfig b/drivers/net/wireless/ath/Kconfig
index c2873a2..76517a4 100644
--- a/drivers/net/wireless/ath/Kconfig
+++ b/drivers/net/wireless/ath/Kconfig
@@ -1,4 +1,4 @@
 config ATH_COMMON
 	tristate "Atheros Wireless Cards Shared Support"
-	depends on ATH5K || ATH9K
+	depends on ATH5K || ATH9K || AR9170_USB