wireless: remove CONFIG_WIRELESS_WDS

WDS has long been superseded by 4-addr AP/client and lacks such
fundamental features like encryption, capability negotiation,
and similar. As such, it was basically always unusable as is.

Back in 2016, in commit 8f20542386 ("wireless: deprecate WDS
and disable by default") I disabled it and made the Kconfig option
only available under CONFIG_EXPERT to turn it back on. Since then,
nobody has complained about that, and given the severe limitations
with the code, it's unlikely anyone would have a reason to.

Remove the Kconfig option now, so we can clean up the associated
code in follow-up patches.

Link: https://lore.kernel.org/r/20201109105103.7d1e44c50e21.I2c0a1705fd6491d9ba3400c88415ee2c4832ae98@changeid
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/Kconfig

@@ -18,19 +18,6 @@ menuconfig WLAN
 
 if WLAN
 
-config WIRELESS_WDS
-	bool "mac80211-based legacy WDS support" if EXPERT
-	help
-	  This option enables the deprecated WDS support, the newer
-	  mac80211-based 4-addr AP/client support supersedes it with
-	  a much better feature set (HT, VHT, ...)
-
-	  We plan to remove this option and code, so if you find
-	  that you have to enable it, please let us know on the
-	  linux-wireless@vger.kernel.org mailing list, so we can
-	  help you migrate to 4-addr AP/client (or, if it's really
-	  necessary, give up on our plan of removing it).
-
 source "drivers/net/wireless/admtek/Kconfig"
 source "drivers/net/wireless/ath/Kconfig"
 source "drivers/net/wireless/atmel/Kconfig"