Use nl80211 as an example instead of WEXT

wpa_supplicant/README-WPS

@@ -55,10 +55,10 @@ wpa_supplicant configuration
 
 WPS is an optional component that needs to be enabled in
 wpa_supplicant build configuration (.config). Here is an example
-configuration that includes WPS support and Linux wireless extensions
--based driver interface:
+configuration that includes WPS support and Linux nl80211 -based
+driver interface:
 
-CONFIG_DRIVER_WEXT=y
+CONFIG_DRIVER_NL80211=y
 CONFIG_WPS=y
 CONFIG_WPS2=y