qcacld-3.0: Finish removing CONFIG_WLAN_FEATURE_11W

Change Id3a2127e9ecb343ad2a0354dcbc331c22167d7fb ("qcacld-3.0: Remove
feature flag WLAN_FEATURE_11W for pmf") removed all of the conditional
code for CONFIG_WLAN_FEATURE_11W. However, the actual Kconfig entry
was not removed, nor was the configuration setting removed from the
defconfig files, so do that now.

Change-Id: I0ba83841346fc47673231fba6aa22da9317caf09
CRs-Fixed: 3487375

Kconfig

@@ -13,10 +13,6 @@ config QCACLD_WLAN_LFR3
 	bool "Enable the WLAN Legacy Fast Roaming feature Version 3"
 	default n
 
-config WLAN_FEATURE_11W
-	bool "Enable the WLAN 802.11w Protected Management Frames feature"
-	default n
-
 config WLAN_FEATURE_LPSS
 	bool "Enable the WLAN LPSS feature"
 	default n