iwlwifi: make MVM and DVM depend on MAC80211

It's not the iwlwifi module that depends on mac80211, but iwlmvm and
iwldvm.  To reflect this better, make MVM and DVM Kconfig options
depend on MAC80211 instead.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/iwlwifi/Kconfig

 config IWLWIFI
 	tristate "Intel Wireless WiFi Next Gen AGN - Wireless-N/Advanced-N/Ultimate-N (iwlwifi) "
-	depends on PCI && MAC80211 && HAS_IOMEM
+	depends on PCI && HAS_IOMEM
 	select FW_LOADER
 	---help---
 	  Select to build the driver supporting the:
@@ -53,6 +53,7 @@ config IWLWIFI_LEDS
 
 config IWLDVM
 	tristate "Intel Wireless WiFi DVM Firmware support"
+	depends on MAC80211
 	help
 	  This is the driver that supports the DVM firmware. The list
 	  of the devices that use this firmware is available here:
@@ -61,6 +62,7 @@ config IWLDVM
 config IWLMVM
 	tristate "Intel Wireless WiFi MVM Firmware support"
 	select WANT_DEV_COREDUMP
+	depends on MAC80211
 	help
 	  This is the driver that supports the MVM firmware. The list
 	  of the devices that use this firmware is available here: