qcacld-3.0: Enable medium assess APIs on AUTO HST

Enable medium assess APIs in qca6390_defconfig

Change-Id: I4a9a6052f303b0a35d7f02e5c8ebf631917a79a0
CRs-Fixed: 2800035

configs/qca6390_defconfig

@@ -793,3 +793,5 @@ CONFIG_SAP_DHCP_FW_IND := y
 #Enable FW Offload
 CONFIG_WLAN_FW_OFFLOAD := y
 
+CONFIG_WLAN_FEATURE_MEDIUM_ASSESS := y
+