ar9170: remove EXPERIMENTAL marker

Cc: Christian Lamparter <chunkeey@web.de>
Signed-off-by: NLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ar9170/Kconfig

 config AR9170_USB
 	tristate "Atheros AR9170 802.11n USB support"
-	depends on USB && MAC80211 && WLAN_80211 && EXPERIMENTAL
+	depends on USB && MAC80211 && WLAN_80211
 	select FW_LOADER
 	help
 	  This is a driver for the Atheros "otus" 802.11n USB devices.
 
 	  These devices require additional firmware (2 files).
 	  For now, these files can be downloaded from here:
+
 	  http://wireless.kernel.org/en/users/Drivers/ar9170
 
 	  If you choose to build a module, it'll be called ar9170usb.