ar9170usb: purge obsolete driver

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/Makefile

@@ -1,6 +1,5 @@
 obj-$(CONFIG_ATH5K)		+= ath5k/
 obj-$(CONFIG_ATH9K_HW)		+= ath9k/
-obj-$(CONFIG_AR9170_USB)        += ar9170/
 obj-$(CONFIG_CARL9170)		+= carl9170/
 
 obj-$(CONFIG_ATH_COMMON)	+= ath.o