cfg80211: fix Kconfig for users of cfg80211

* iwm doesn't depend on cfg80211 or wireless extensions
 * rndis wlan selects cfg80211 - needs to depend
 * mac80211 selects cfg80211 - needs to depend

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/Kconfig

@@ -1,16 +1,19 @@
 config MAC80211
 	tristate "Generic IEEE 802.11 Networking Stack (mac80211)"
+	depends on CFG80211
 	select CRYPTO
 	select CRYPTO_ECB
 	select CRYPTO_ARC4
 	select CRYPTO_AES
 	select CRC32
 	select WIRELESS_EXT
-	select CFG80211
 	---help---
 	  This option enables the hardware independent IEEE 802.11
 	  networking stack.
 
+comment "CFG80211 needs to be enabled for MAC80211"
+	depends on CFG80211=n
+
 config MAC80211_DEFAULT_PS
 	bool "enable powersave by default"
 	depends on MAC80211