qcacld-3.0: Enable interface manager

- Enable interface manager config flag.

Change-Id: I7e460cd98de20f335f558cf1dcb33c3a2a93360d
CRs-Fixed: 2791468

configs/default_defconfig

@@ -1165,7 +1165,7 @@ CONFIG_CM_ENABLE := n
 CONFIG_CM_ROAM_OFFLOAD := y
 
 #Flag to enable interface manager
-CONFIG_INTERFACE_MGR := n
+CONFIG_INTERFACE_MGR := y
 
 #Enable VDEV OPS wakelock feature
 CONFIG_FEATURE_VDEV_OPS_WAKELOCK := y