qcacld-3.0: Enable FEATURE_SET feature in qca6390_defconfig

Enable feature set feature flag to report required feature
set information.

Change-Id: I13460f58ad054f3e135598ec3918dbcfbf2a1834
CRs-Fixed: 3622492

configs/qca6390_defconfig

@@ -625,6 +625,8 @@ CONFIG_DISABLE_CHANNEL_LIST :=y
 #Flag to enable Dynamic Voltage WDCVS (Config Voltage Mode)
 CONFIG_WLAN_DYNAMIC_CVM := y
 
+CONFIG_FEATURE_SET := y
+
 CONFIG_WIFI_POS_CONVERGED := y
 ifneq ($(CONFIG_WIFI_POS_CONVERGED), y)
 CONFIG_WIFI_POS_LEGACY := y