ar9170: single module build

This patch restores all-in-one module build procedure for ar9170.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/Makefile b/drivers/net/wireless/Makefile
index 5e7c9ac..50e7fba 100644
--- a/drivers/net/wireless/Makefile
+++ b/drivers/net/wireless/Makefile
@@ -57,6 +57,6 @@
 
 obj-$(CONFIG_ATH5K)	+= ath5k/
 obj-$(CONFIG_ATH9K)	+= ath9k/
-obj-$(CONFIG_AR9170_COMMON)	+= ar9170/
+obj-$(CONFIG_AR9170_USB)	+= ar9170/
 
 obj-$(CONFIG_MAC80211_HWSIM)	+= mac80211_hwsim.o