iwlwifi: is no longer experimental

It really hasn't been for a long time, not sure
why this stuck around.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/Kconfig

 config IWLWIFI
 	tristate "Intel Wireless Wifi"
-	depends on PCI && MAC80211 && EXPERIMENTAL
+	depends on PCI && MAC80211
 	select FW_LOADER
 
 config IWLWIFI_SPECTRUM_MEASUREMENT