iwlwifi: make Makefile more concise

Also change CONFIG_IWLCORE_RFKILL to CONFIG_IWLWIFI_RFKILL to
be more consistent with other config variables.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/Kconfig b/drivers/net/wireless/iwlwifi/Kconfig
index bcaa61b..f844b73 100644
--- a/drivers/net/wireless/iwlwifi/Kconfig
+++ b/drivers/net/wireless/iwlwifi/Kconfig
@@ -6,7 +6,7 @@
 	bool
 	default n
 
-config IWLCORE_RFKILL
+config IWLWIFI_RFKILL
 	boolean "IWLWIFI RF kill support"
 	depends on IWLCORE
 	select RFKILL