net: wireless: Rename CONFIG_ATH6K_LEGACY to CONFIG_ATH6K_LEGACY_EXT

CONFIG_ATH6K_LEGACY already exists in kernel tree so renaming to
CONFIG_ATH6K_LEGACY_EXT to support QCA AR6003 (Non cfg80211) driver
which will be compiled outside of kernel tree. AR6003 driver needs
WIRELESS_EXT support. WIRELESS_EXT is going to be deprecated so
adding it to defconfig will not work.

Change-Id: I171a3e4dbdf9bd2cf7e7eaa3741ec2fa9730a114
Signed-off-by: Sridhar Parasuram <sridhar@codeaurora.org>
diff --git a/drivers/net/wireless/Kconfig b/drivers/net/wireless/Kconfig
index b83e871..bb16fbb 100644
--- a/drivers/net/wireless/Kconfig
+++ b/drivers/net/wireless/Kconfig
@@ -283,13 +283,15 @@
 	---help---
 	  A driver for Qualcomm WLAN SDIO Libra chipset.
 
-config ATH6K_LEGACY
-	tristate "QCA AR6003 wlan SDIO driver"
+config ATH6K_LEGACY_EXT
+	tristate "QCA AR6003 wlan SDIO driver - External"
 	depends on MMC_MSM && WLAN
 	select WIRELESS_EXT
 	select WEXT_PRIV
 	---help---
-	This module adds support for wireless adapters based on QCA AR6003 chipset running over SDIO.
+	  This module adds support for wireless adapters based on QCA AR6003 chipset
+	  running over SDIO. Driver is built outside of kernel tree, this config
+	  only enables configurations required for QCA AR6003 wlan driver.
 
 config WCNSS_CORE
 	tristate "Qualcomm WCNSS CORE driver"